@brittico

Your Firewall has a list of sites it prevents access to - a 'blacklist'.
There is a 'whitelist' of sites that are allowed.
Manage your Firewall and add *.sketchucation.com to that...

@gullfo

I was think of that...
Since very few have reported an issue it must be a rare RB file you have that's causing this issue.
BUT can we get v5.0.2 out first.
Then I'll PM you something later this week.
Thanks for your help.

Rather than prolong this...
Here's the updated v2.0 of the RB, which now meets modern standards etc, and works in v2024 [and earlier]
ExtrudeAlongPath.rb

v5.0.2 should be out very soon...

@QZHOU

You need to install the latest versions of the extension, LibFredo6 and the SketchUcation toolset [for the licensing].

That error message says the signature-file cannot be read.
You may have changed your computer's name, which invalidates it.
It suggests you open the signature-file's folder and delete it.
After a restart a new signature file is made to suit the current setup.
The validate your license[s]...

Note that errors like this can also occur if your computer's name contains non-ASCII characters - going against the advise of Windows.
I suspect that you are Chinese - so have you got any special-characters in your computer-name ?
This can break licensing setups like this...
Try renaming your computer following these rules...

A-Za-z0-9 - are OK

The following are not OK...

period (.)
backslash (\)
forward slash (/)
colon (:)
asterisk (*)
question mark (?)
quotation mark (")
less than sign (<)
greater than sign (>)
vertical bar (|)
And ay other special characters or non-ASCII foreign alphabet letters will also cause issues,

If your AI is clever enough. you need to ask it how to process the entities inside definitions [i.e. components and groups] using an iteration...

@Fer18
Your posts makes little sense !

If you need LibFredo6 download/install it from the PluginStore.

If you need some other Plugin [aka an Extension] then post in its thread - OR explain yourself better - we are not mind-readers...

Works well.

But I have a few observations from a non-AI view-point...

The Dynamic_Subdivide.rb file uses several $xxx... global variables - these are frowned upon because they can pollute all other Ruby files [and are not acceptable in extensions submitted for review in the EWH].
It's a simple fix - replace them all with @xxx... variables that then work across methods in the same modules, but not 'globally' in unconnected scripts.

That Dynamic_Subdivide.rb file also has potential trip-hazards as Rich pointed out -
e.g. in line#190 it's possible for it to reference an edge of a face that is no longer valid, as specified in an earlier line, so it falls over.
This not valid issue occurs when your operation does something to geometry that affects a previously made collection of things -
e.g. adding a new face [or edge] overwrites an existing face [or edge] so a reference to it is no longer valid.
Again it's a simple fix - add a 'skip' trap near the start of the block -
e.g. like this
faces.each do |face| next unless face.valid? ... end
which skips any invalid faces and so the errors are sidestepped.
You can do a 'find' in the code to add in similar traps like this for any non-valid face, edge, vertex etc.
Also note that the various blocks have an inconsistent format, swapping between
xxx.each { |e| ...xxx... }
to
xxx.each do |e| ...xxx... end
But editing either of them is possible with a little care.
Both forms are acceptable, but choosing to use just one for consistency is recommended...

Get the latest version from the SketchUcation PluginStore
http://sketchucation.com/resources/pluginstore?pln=2Dtools
or why not use the AutoInstall feature of the 'SketchUcation Plugin Store' toolset's dialog...

One further issue you should address before publishing this more widely - e.g. getting it 'signed' and in the EWH.
Its file naming does not follow the proper conventions.
An RBZ must contain just one .RB file that registers the extension and a folder of the exact same name.
Also the convention is to prepend the users 'name' at the start and even a sub-level if the modules do this.
So in your case there should be MendelAI_mesh_tools subfolder and a .RB file named MendelAI_mesh_tools.rb
You then edit the RB to load MendelAI_mesh_tools/loader

Because previous users might also now have the older badly named file/folder installer and loading you need to do some tidying up.
Add some code to the start of the RB to check for the existence of mesh_tools_loader.rb and mesh_tools subfolder in the Plugins folder -
use File.exist?(str) or better still similar methods in the fileutilities [which you need to 'require'] which will make deleting the subfolder and its contents much easier. So if these files exist you should also add a UI.message_box() to ask the user to restart to sync everything - next time the rogue file/folder won't be found and the code is redundant, but is still needed in any future updates in case a user has skipped this change in 1.0.2... A manual restart is preferable to a forced quit etc as the user might not have saved some work before updating etc.

Only on a flat Z-plane - these are 2D Tools...
Although some like Fillet work in '3D' too...

Version 5.0.6 is now available:
https://sketchucation.com/pluginstore?pln=SketchUcationTools

It's trapped for a very rare error [only one report to date!] which splatted the tool on loading, when it was checking an extension's version for the update report - if the user's installation of that extension's files is somehow incomplete - perhaps because of the use of su's migrate tool across versions glitch ? [Note: this principally affected just some of Fredo's and perhaps Thomthom's extensions, where Extension-Manager then lists it without a version etc and they were unloaded in the PluginsManager]

There are several 'reglue' plugins around [there's even one within my HolePunch tool menu!]
However, I wrote this one a couple of years back and Jim spotted it wasn't 'indexed' - so here it is...

SketchUp Plugins | PluginStore | SketchUcation

SketchUp Plugin and Extension Store by SketchUcation provides free downloads of hundreds of SketchUp extensions and plugins

(sketchucation.com)

It works best with >=v2014
This is the oldest version I have...
SectionCutFace+_v2.6.rbz
or try this...
SectionCutFace_v6.2.rbz

In my UK jurisdiction, and I suspect many more, you are not allowed 'winders' but 'tapered treads'.
The calculation of the dimensions is convoluted.
The minimum 'going' is 50mm [2"] and any tapering tread at the centerline must have a 'going' measured square to the nosing equal to all the other non-tapering treads.
For non-domestic wider stairs the measurements are taken measured in from the sides - about 1/3 each.
The 'going' is not the 'tread' dimension - the overhang of the nosing is taken off the tread size, so it's the 'plan' dimension.
When you get to anything other than a simple staircase it can become very complicated to 'automate'.
In the UK a helical stair [aka 'spiral'] even has a set of alternative British Standard staircase rules which differ significantly from the usual stair Building Regs - you need to tell the local inspector which one you're using otherwise you could fail.
I've mentioned before about the handrail requirements in the regs to extend 300mm [12"] beyond the top and bottom nosings in many situations, and the landing's going the be 300mm longer than the stair width.
Also, staggering the nosings by one going as the stair turns at a half-landing [or top] means that the handrail transitions smoothly without any need for a vertical portion to make it work...

Being 'unsigned' need not be a problem.

Edit your native Extension Manager settings - Loading Policy > Unrestricted

Restart SketchUp and version-compatible, but 'unsigned', extensions [i.e. usually older] will then load OK.
Only install extensions from trustworthy sources - like SketchUcation, the Extension-Warehouse and a few developers' sites which offer direct downloads...

Version 2.0 is available from the PluginsStore.
https://sketchucation.com/pluginstore?pln=TIG_points_cloud_triangulation
It fixes issues with delauney3.rb using Constants in away that newer SketchUp versions Ruby chokes on, t also includes some tweaks of the main code - Layers v. Tags etc, and the RBZ is now signed...

And if you erase that file you will need to re-validate the licenses...

This works in all newer versions of SketchUp.

Any error messages in the Ruby Console ?
Are you following the detailed instructions.
It hasn't been supported for sometime - the author has stopped all development on his extensions.
Although it's old it has been reported as working in versions up to a few years ago...