@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 ?