That is not the correct location to install plugins. Do not add plugins to the Tools folder if you want them to work.
There is an App Data/Roaming path but it is normally hidden so you would need to unhide it first to gain direct access. Normally you shouldn’t need direct access to it since most plugins/extensions now come with the .rbz file extension. They can either be installed directly via the Extension Warehouse or the Sketchucation Plugin Store. Other plugins that you might download as .rbz can be installed via Preferences>Extensions>Install Extension.
If you type “%appdata%” (without the quotes) into the Search box in the Windows Start menu or Start screen and press Enter, Explorer will take you to the Appdata folder.
The correct path is C:\Users\<your username>\AppData\Roaming
Thanks for the helpful responses and Windows 10 tutoring ( I have been too many years with a corporate computer and was unfamiliar with unhiding hidden files. I have a lot to learn about self-IT support.)
I attempted to load plugins form the link in the video “Usefull Google Sketchup Plugins” - Useful Google Sketchup Plugins - YouTube. The link from the video notes is not through the Sketchup Extension Wharehouse. … Lesson Learned
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That looks like a good video! One issue for you may have been that it is almost five years old. Extension management has changed in the last half decade!