@L-i-am
Probably the way those who disagree with the powerful seem to 'accidentally' fall from high windows more frequently than you'd expect ?

The following extensions of mine have been updated for compatibility with v2024 Ruby - the deprecated Fixnum has been removed.
https://sketchucation.com/pluginstore?pln=ExtrudeTools - v6.0
https://sketchucation.com/pluginstore?pln=Latticeizer - v1.9
https://sketchucation.com/pluginstore?pln=Roof - v6.0
https://sketchucation.com/pluginstore?pln=SKMtools - v20240425
https://sketchucation.com/pluginstore?pln=TIG_Smart_offset - v4.0

Welcome back to the forum, safely I hope for you and yours...

v5.0 of PurgeAll is available - it fixes some minor glitches with v2024 changes...
https://sketchucation.com/pluginstore?pln=PurgeAll

@i5963c
The reason the toolbar appears is, because there are updates available - hence the red marker on the first button - not present otherwise.
If you open the ExtensionStore dialog and choose to install the updates, then close the toolbar, when you restart SketchUp the toolbar stays off, until you next activate it.
If you don't want the updates simply dock the toolbar in the side bar with others, it's unobtrusive...

@sashapepperspray
The method File.exists? has long been deprecated, but worked.
In the latest Ruby version it doesn’t - File.exist? - works in v2024 and older versions as well.
Many developers are working to adjust their code accordingly.

Have patience and post any instances in an affected extension's thread - as there are 100s of 1000s of line of code with the tiniest corrections needing to be found and change, then the extension re-encrypted and signed…

Many authors have already fixed their extensions, so look regularly to see if there’s already an update available…

@Joel3dm
Yes.
Make the non-auto-updating SectionCutFace unLocked and choose a material/color that's already used in the model [from a list].
A SCF's material applies to all faces, but you can edit the group and apply any material to any face etc...

Use the Outliner.
You can then expanded the 'tree' and select the nested Container, and double-click it in the Outliner to edit it that way.

v5 is now available in the PluginStore / ExtensionStore³
https://sketchucation.com/pluginstore?pln=Multiple_Offsets
It's now compatible with the newer SketchUp version's Ruby methods [e.g. 'FixNum' was deprecated in favor of 'Integer']
The RBZ is now also 'signed' to suit all Loading Policies...

You can't do that in one step. Do this.
Use the Tape-measure tool to make the first at 1/2" as before click to confirm, Select the guide line, and chose the Move tool, press Ctrl to invoke Copying, make the copy off 1/2" and immediately type 9x press Enter to confirm.
Now you have 10 guides at 1/2" spacing.
You can make multiple offset copies of selected things, including guides, but you can use the Tape-measure tool to make more that one guide at a time.
You can also make radial copies at set angles using Rotate + Ctrl for Copy and entering the number needed, press enter.
It's probably best that when inputting lengths or angles to the use 9x rather than x9 as the leading letter might sometimes get confused with ab x shortcut.
To make guide copies at a set spacing, e.g. use 9x but if you want to divide between a start and end guide manually pick the start and the final one and use 9/ to divide - that way you don't need the exact dimension, but can be sure the spacings are all equal.

Step by step questions...
Can your IT guy get a cmd script to run at user's login ?
Can your IT guy then make that cmd script copy the license files from an admin-account's folder-structure into an equivalent folder in the user's account - e.g. '../appdata/local/scf licenses' ?
If this happens why can't the user then see the expected license files ?
I'm no cmd script guru. but surely your IT guys have some helpful ideas ??

e.g. If you manually copy over the license files from an admin-account's folder-structure into an equivalent folder in the user's account - e.g. '../appdata/local/scf licenses' - does that then work as expected ? If not, then why not ?

@ntxdave
The magnifying glass button is the first of the four icons at the right-hand end of the topmost title bar of the forum itself, NOT in the the title bar of the first post in a thread to the left of the 'Reply' button...

You've already learnt that you don't need to project the shadows of every element forming the building, or every plane that might catch a shadow.
Before you use the tool make a new tag to ultimately be an isolated set of geometry with the rest of the model 'off' - probably making two to reflect the original and modified forms.
then make a group that is assigned the appropriate tag.
Edit it and add simple faced 'box' shapes that follow the main external form of the building [used as a temporary underlay].
Only add in any wall, floor or roof faces etc, that will cast useful shadows.
You can probably ignore window-openings for a study this simple.
Do not include any 'rear' facing elements that won't cast meaningful shadows.
Do not include any wholly internal faces as they won't cast any useful shadows.
It should be relatively straightforward for you to work out which parts are needed - but the algorithm will look at everything.
Every superfluous bit of geometry which might not cast any meaningful shadows should be avoided -
because each one will still be pointlessly considered and processed before finally being ignored -
all of this only bloats the processing time exponentially and can lead to crashes as SketchUp becomes overwhelmed.
Perhaps an uploaded screen shot of the form, or even a simple skp showing what you've done so far, could elicit more useful advice...

Following on from @fredo6 's comment...
If each user logs in separately then surely a simple cmd script [written by your IT guys] auto-running at their login, could copy the needed license files over into their '../appdata/local/scf licenses' directory. Having this consistent location set up for everyone's folders/files should ease the license reading / validation ? Perhaps a logout cmd script could also run to tidy up and remove the no longer needed files, if thought appropriate ? ...

Perhaps @fredo6 would like to comment...

@Ramon3D

Several questions...

Does each of your students have a full copy of the the extension installed on their computer in their user's SketchUp Plugins folder ?
Also do they have a copy of the LibFredo6 installed on their computer in their user's SketchUp Plugins folder ? It's needed to support the extension.
And do they have a copy of the SketchUcation toolset installed on their computer in their user's SketchUp Plugins folder ? That's needed for the licensing.
Do they have a copy of the relevant license file saved onto their computer, and also has it been validated for that user and that device ?

@fredo6 will probably reply in more detail about the multi-seat licensing setup.

The recent update of our toolset sidesteps the particular startup error, but it won't stop the underlying issue of a badly installed extension causing issue - such as having a missing file causing an extension to miss out its version.
I assume from your explanation that you've deleted the Fredo extension's RB file AND its matching subfolder - and then the error was avoided.
If you install a fresh copy of it I presume that you no longer have an issue,
because the necessary file set will now be there,
and the Extension-Manager should then report it with its proper version info etc...

If it works in v2024 [see earlier posts] it'll probably work in v2026.
Try it.
To install an extension from a ZIP archive file rather than from an RBZ you will need either to change the file-type suffix, or even easier use the SketchUcation submenu item to install it from Archive, which works for both RBZ and ZIP archives...

The current LibFredo6 works with all recent versions of Sketchup.
There is also a legacy version in the PluginStore for older versions - i.e. <= v2016

What are 'the error messages' ?
A BugSplat or something else ?
What is your MAC OS ?

Select its icon and right-click > context-menu > Run as administrator.
A dialog opens, when prompted choose Repair.
This will fix any incorrect permissions etc that can cause unpredictable issue.
Restart SketchUp to see if anything has improved.
Repair will not affect any customization.
Double-clicking