Which extension[s] did you buy a license for ?
Have you looked in https://sketchucation.com/webshop/my-licences.php

Can you please explain more about its function and use...

If you have exceeded the trial period you must buy a license...

There is currently no license for this extension, it's a beta release.
Please post error/messages etc which lead you to believe a license is needed...
It works for me, no issues.
There is no 'licensing' entry in its submenu ??

@Stephen-H

PS: I believed you... but if you go the the EW's page Github link to TT_Lib and go to this page:
https://bitbucket.org/thomthom/tt-library-2/downloads/?tab=tags
Scroll down to 2.10.2 and on the right click ZIP and an old archived version can be downloaded.
Then extract the ZIP file's contents. You only need the TT_Lib2.rb file and TT_Lib2 folder - ignore the rest.
Copy those two into your Plugins folder [you can open that using the Extensions > SketchUcation submenu item] and then restart SketchUp to sync. This old Lib is not 'signed' in its subfolder, but as long as you have your Extension Manager > Loading policy set to 'Unrestricted' that won't matter.
Does that work ?

@Stephen-H

The current version 2.15.1 works fine with the latest version of CleanUp, up to and including v2026. What is your issue exactly ?

I haven't tried it on v2019 like yours, as I no longer have a copies installed older than v2023 - TT_Lib's EW page says, compatible >= v2022.
I suggest you try and contact @thomthom direct and ask if he has kept an archived version ?

When you say 'this' please be clear. The RBZ for the SketchUcation toolset which also control the licensing and ExtensionStore dialog etc is easily installed using the native Extension Manager > Install... button. Restart SketchUp afterwards to sync everything. It appears in its own submenu under Extensions and there is also a Toolbar.
LibFredo6 is not needed for the toolset, but it is vital to all of Fredo's extensions.
If you have not installed SketchUp itself 'properly' then you do not need to Uninstall and Reinstall it, instead close SketchUp, then find the SketchUp Installer's exe file in your Downloads folder [or download a fresh copy]. Select the exe file's icon, right-click > context-menu > Run as administrator - a dialog should open, accept the 'Repair' option, this will reset all of the permissions properly so extensions can install and save preferences etc. In a few rare case with some of Fredo's stuff a further manual deletion of a badly permission-ed subfolder etc is occasionally necessary, but let's cross that bridge as we come to it !

@Tpdart

Explaining how you fixed things helps others reading this, and gives useful feedback to moderators and experienced users who might be 'advising'...

Did you try doing the Signature file deletion that the dialog suggested and try again ? Also check that the following extensions are up to date and installed and SketchUp restarted - SketchUcation toolset [for the licensing], the actual Extension[s] in question and if appropriate LibFredo6.

If you have renamed your computer or copied files over from elsewhere, then this error can occur. If you Computer's name [and indeed your User-name] go against the recommended format of just ASCII letters + numbers and some limited punctuation - e.g. you've used accented letters or special-characters etc - then this can also cause errors like this - so try to rename your computer sensibly...

@LayaCZ

I have tested the RBZ and it is definitely installing SubD in error, although the RBZ is properly named ?? Perhaps @thomthom or @rich-o-brien or @Gábor can shed some light on this weirdness

Have you installed and restarted the following latest versions from or PluginStore / ExtensionStore -
SketchUcation tools
LibFredo6
Each of the Fredo's extensions raising the issue

Also issues can arise in reading the license file if your Computer or user-account has a name that doesn't follow the Microsoft naming requirements.
That is just ASCII characters alphanumeric and some limited punctuation - so for example - users with accented or foreign characters sometimes get this kind of issue as the paths etc are sometimes confusing to Ruby interpretation...

Here's v1.4
https://sketchucation.com/pluginstore?pln=TIG_ShowTime

The Export PNGs coding has been streamlined and the time taken per image & total is now reported in the RC.

@hshieds1

Have you tried the simple edit for the delauney3.rb script [which it needs] to make it suitable for the newer versions of SketchUp's Ruby ?
It is explained a few posts above this - https://community.sketchucation.com/topic/136273/plugin-voronoi-conic-curve/131

See my reply in your duplicate post.

Ensure that you have the newest versions of the extension installed, and LibFredo6 and the SketchUcation toolset [which manages licenses].
Restart SketchUp to sync everything.
If you can't manage the licenses in the Tools submenu entry for the extension, then use the SketchUcation PluginStore page [logged in] item in its drop-down 'My Licenses', which should let you manage your licenses. If all of this fails text back and someone in support will try to help...

Here's v1.3
https://sketchucation.com/pluginstore?pln=TIG_ShowTime

The Export PNGs code has been adjusted to export only those Scene-tabs with 'include in animation' ticked in their Scene details.

The Help file has been adjusted accordingly...

The link in the very first thread in this topic contains the working url to download the zip file containing the txt font's ttf file.
https://community.sketchucation.com/uploads/imported_attachments/pdqA_txt_____.zip
I just used it.
I can't see what your issue might be...

Following my post about setting up your model's shadows for date/time-stamping and export, I had assumed the first steps to be self-evident - but for the avoidance of doubt...
Your model needs to be Geo-located to show correct shadows - because the UTC Time-Zone and its actual location are both important.
Use the Model Info section for this.
For example, the shadows at 08.00 in Southern England and in Northern Scotland are quite different despite them sharing a Time-Zone.
Also the model's default 'North' is the Y Green axis, but there might be an offset shown orange in the results. Make sure the Z Blue axis is 'up'.
If you have modeled the building 'on axis' but have a building that is in reality 'off axis', you can resolve this by making a group of everything, and then rotating that group to suit the actual North, when you edit that group its axes with it will still align as before; any further modeling within that group will also remain 'on axis' for your building, whilst it is actually placed in the world correctly.
The model's Shadow settings should now reflect its Geo-location.
Alternatively of older versions, if you want to adjust the 'north solar axis' manually, then there's a su_ tool available in the EWH - https://extensions.sketchup.com/extension/393f5153-ba5f-4f5f-849f-46b32cf64bd4/solar-north
I have Geo-location set up on my usual Template for my regional location, set manually using the Model Info dialog's section.
You can set up templates for various locations if you work in several different areas.

@omni
What software do you mean ?

Have you got the latest versions of the extensions and SketchUcation toolset ? This is needed to manage the licenses effectively.
Have you tried the forums 'My Licenses' page in the PluginStore, or perhaps easier to use, the page accessed from the ExtensionStore dialog's 'Quick Menu' called 'Licenses' both of which let you manage your licenses Release/Activate etc...