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

This suggests that your extension's free trial period has expired.
At the moment the extension is not licensed.
You must download the license file onto your computer, then apply that license [validate] to the related extension.
You need the latest version of the extension, LibFredo6 and the SketchUcation toolset installed and SketchUp restarted to sync everything...
There are lots of help posts and so on in the forum...

After installing any updated extensions, libs and the latest SketchUcation toolset, close SketchUp and restart it again to sync everything...

Read the post before yours, it announces a update, which should fix this...

Is there a way to increase the size of the top-landing or intermediate-landings so that the nosings are one tread dim offset ?
That way the handrail turns properly - smoothly without a vertical drop.
Some localities' codes require the landings to be a tread or 300mm bigger than the stair's width.
Also extending the handrail a similar amount at the top and bottom is required...

Separately... the FollowMe twisting of the profile along complex paths is longstanding.
Extensions like Upright Extruder sidestep this; so you need to emulate those...

If you set the component's axes to match its face then it's no longer rotated at 45° when it's saved out of the model.
Just leave its axes as the default [45° off the face], and then it'll import into another model rotated as you hope, because then the component's geometry is not exported as axial.

AI forgot the doors !
Otherwise it's pretty good...

@Salvaier
After it's installed it creates a Tools submenu item.
In the dialog there's a Fredo6 Collection item and under its Curvizard there's 'license'...
In the dialog that opens there's a Purchase License button...

@Aris
Probably @fredo6 needs to get involved to resolve this.
I still suspect that your LibFredo6 is not the newest version - it should be v14.9a
To confirm this open the Extensions > Extension Manager dialog and expand LibFredo6's info to see the version...

You could also close Sketchup and open its Plugins folder and delete the file Fredo6_!LibFredo6.rb and subfolder Fredo6_!LibFredo6. Then open SketchUp [you'll probably get some error messages] and use the SketchUcation ExtensionStore³ to install afresh copy of LibFredo6.
Restart SketchUp to re-sync everything, report back if that helped...

@Aris
Have you installed the latest versions of the extension, LibFredo6, and the SketchUcation toolset [for the licensing] ?
Restart after the installations to sync everything...
I suspect your Lib is out of date ?

@Nicolla

If you try it with the Ruby Console [Extensions > Developer submenu] open do you see any error messages, or do you get any other error message dialogs when trying it ?
If you attach a simple SKP, with the problems you are experiencing, and a step by step of instructions, it would help us understand your problems...

@SilentFart

But you haven't mentioned the next step where I gave you the exact menu-path to it...
Tools > Fredo6 Collection submenu, as 'ThruPaint'....

@SilentFart

You need to restart SketchUp after it's installed to sync everything.
After that it's listed under the menu 'Tool's > 'Fredo6 Collection' submenu, as 'ThruPaint'....

@FairhavenMatt

Also remember that working on any program's files that reside away from your computer also risks losing data when saving - which is irretrievable.
Always work on a version of the file on your computer, saving it there as you work.
When that work is completed save a copy of the file over onto the 'remote' location.
Having your version on your computer is no harm and a useful safety net if you get problems with the remote copy getting made.
Making a remote copy of a file is far less likely to cause any issues, as the OS is very robust at doing this, whereas any ap saving remotely is more likely to have hiccups...
In your case the remote location is not accessible, but if it had been you have the ever present risk of a glitch in the file's data - potentially making it unusable...

@Prorab

It says you already have three seats allocated to computers using those licenses., so there are none free
If you have changed the name of a computer, then that counts twice etc.
You can log in and manage your licenses using
https://sketchucation.com/webshop/my-licences.php
Remove what's not needed and then validate again...
Also ensure you have the latest versions of the extensions, LibFredo6 and the SketchUcation toolset [for licensing] installed and SketchUp restarted to sync everything...

@ZG53
If you read all of the thread and the guidance notes...
The JAR files that ImageTrimmer uses must run/open in Java.
So firstly you need to have Java installed [if you don't already have it, the it's freely available off the www...].
Next you must ensure that the JAR files are set to open with Java, many unZIP/decompression tools like WinRar hijack that file type and open it themselves [uselessly]. Go into the associated filetypes in WinRar and untick .JAR...
ImageTrimmer should now run as intended, although to do need to ensure it's working on a PNG file Image with fully solid and transparent areas...

@Yarun

It's a Firewall setting in your computer's security settings [or Network security settings, or your AntiVirus tool settings]
*sketchucation.com* should be set in the whitelisting...

@Mike-Amos

Did you install SketchUp 2024 in the approved way ?
You can repair it either way...
Close v2024.
Find the v2024 installer's exe file [usually in your Downloads folder]
Select its icon, right-click > context-menu > Run as administrator...
When prompted choose 'Repair'.
When it completes restart SketchUp.
Any better ?

@Mike-Amos

Are things shown as 'installed' in the native Extensions Manager dialog ?
Is the SketchUcation Toolbar listed as an available toolbar ?
Have you tried activating it ?
Is SketchUcation listed under the Extensions menu - you can activate it from there too ?
or... are you saying something else ?
Are you saying that the Plugins [Fredo's?] aren't listed in the Tools menu items ?
Do you have the latest version of LibFredo6 installed ?
Have you restarted to sync everything after the installations ?
Have you downloaded the appropriate licenses
Have you validated those licenses for each extension ?

More info please...