Without knowing exactly the steps and settings it's hard to deduce what happened.
Some temporary cpoints are not getting made, not returning their position and causing the error message.
I just checked it and it worked OK.
But the Temp folder's SketchUp log file does show some missing 'commit_operations', which can cause bugsplat errors etc...
I'll put it on my long 'to-do' list...
Meanwhile make sure you same the model before doing anything complex like this in case there's a splat ...

@maximus

You need a license for the full version.
https://sketchucation.com/plugin-list.php

Or use the free version of ThruPaint which is included in the free FredoTools

@Marquez24
If you have purchased a license from S4u, you will have given your email address, and then got back a 'code'.
Then to register the licensed extension you need to add the same email address and that code.
After that the message should not reappear...

My old script https://sketchucation.com/pluginstore?pln=dropverts ?

When you say 'not accepting it on download' it is unclear.
Have you installed it using the Extensions > Extension Manager ?
If so restart SketchUp and it should appear in the Toolbars list and under the Extensions submenu 'Chris Fullmer Tools'.
It is an older extension and is unsigned.
This means that SketchUp will not load it unless the Extension Manager's Loading Policy is set to 'Unrestricted'.
After resetting that you need to restart SketchUp to sync everything...

@rv1974

It doesn't use the simplae SUp UI.inputbox method, it uses TT's own HTMLdialog to make the interface.

@rv1974
It can't be non-modal because it uses the UI.inputbox which is always modal.
Thre has to be a way of closing the window - in this case it's OK or Cancel...

It might be a relatively easy edit to fix it.
But the Ruby Console errors are needed...

The author no longer supports any of his extensions.
This one is almost 14 years old !
Are you sure you are following the directions ?
With the Ruby Console open, before using it, do you see any messages ?

The joints need to be whole or a half [or zero]. At the moment the short lengths of joint don't add up to a whole joint, hence the oddity when the texture repeats.

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...

@gkont1983
How have you tried to install Libredo6 ?
The two ways are:
Download its RBZ from the PluginStore, then use the Extension manager to Install it. After that restart SketchUp to sync everything.
Or use the SketchUcation toolset ExtensionStore dialog to find it, click to auto-install it - sidestepping the RBZ download. After that restart SketchUp to sync everything.
You need the SketchUcation toolset installed for the SCF licensing etc - especially of many of Fredo's extensions.
So I recommend you download its RBZ from the PluginStore, then use the Extension manager to Install it. After that restart SketchUp to sync everything.
After that always use the ExtensionStore dialog to install future extensions - it's vital for licensing, but it offers lots of other perks too...

I suspect you need to reinstall this extension [and perhaps some others?]
Extensions don't automatically 'port' over from an earlier version of SketchUp when you install a newer one -
although v2025 does have a new extension to let you do that -
but it's not 100% foolproof, and reinstalling them manually does let you do some tidying up and housekeeping, to keep your extensions 'lean-and-mean'...

Please read its usage notes.
You must have just one section-plane selected.
The right-click menu then offers you the tool with options as appropriate.
It does not appear in any other menus or have a toolbar...
You need to read its usage notes to understand how it works and to get the results that suit you...

@atelierpaar

Basic 3dText is not 'editable', you need an extension like this -
https://sketchucation.com/pluginstore?pln=tt_texteditor

Feel free to cannibalize parts of my ImageTrimmer, which smooths jaggedness...

You pass the edges' collected vertex points, and set an epsilon factor... thus.

      ### epsilon is a float perhaps < 0.2 
      ### perhaps it's set by the user ? experiment for best default...
      ### the vertices are collected from the current outline[s]
      points = vertices.collect{|v| v.position }
      simplified_curve = douglas_peucker(points, epsilon) ### might return []
      simplified_curve << simplified_curve[0] if simplified_curve[0]  ### so it 'loops'
      edges = some_entities.add_curve(simplified_curve) if simplified_curve[0]
      ### sort out edges' faces, hide edges etc as desired

the 'douglas_peucker()' method is this...

  ### http://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm
  ### http://en.wiki.mcneel.com/default.aspx/McNeel/
                                        PolylineSimplification.html
  ###
  def douglas_peucker(points, epsilon)
    ###
    return points if points.length < 3
    ### Find the point with the maximum distance
    dmax = 0
    index = 0
    line = [points.first,  points.last]
    1.upto(points.length - 2) { |i|
       d = points[i].distance_to_line(line)
       if d > dmax
         index = i
         dmax = d
       end
    }
    ### If max distance is greater than epsilon, recursively simplify
    result = []
    if dmax >= epsilon
      ### Recursive call
      recResults1 = ImageTrimmer.douglas_peucker(points[0..index], epsilon)
      recResults2 = ImageTrimmer.douglas_peucker(points[index...points.length], epsilon)
      ### Build the result list
      result = recResults1[0...-1] + recResults2
    else
      result = [points.first, points.last]
    end#if
    ###
    return result
    ###
  end #def

This is worthy successor to my oldie ImageTrimmer - much faster and with better in-built toolset...
Can't wait to try it !

@lamngoaison

The linked post contains a ZIP file posted a few days ago
link
Which can be converted to an RBZ by changing its filetype suffix.
It worked in v2024, so should also work in v2025 ?

@masmoosa
What extension are you referring to ?
There's insufficient info for us to help you.
Please give us a clear description of what you are trying to do, and what problems you are experiencing...

Have you actually installed the app properly ?
Running it from the downloaded app's installer can work, but it can also have weird side-effects like this...