That did the trick! There were files duplicated in both locations - I just uninstalled all of the extensions that had been located in the incorrect folder and reinstalled. Now we're working just fine - thanks for the tips!

My PC gives me two options for locations to install the plugins -

#1 - C:/Users/build/AppData/Roaming/SketchUp/SketchUp 2023/SketchUp/Plugins

#2 - C:/ProgramData/SketchUp/SketchUp 2023/SketchUp/Plugins

When I use location #1 I get the "unable to unzip archive" message. When I use Location #2 the download is successful but SketchUp doesn't know the plugin is there, regardless of the number of restarts and reloads.

My apologies, my level of computer literacy is just above "get off my lawn".

Thank you for the quick response! Your solution seemed to work - right up until the "UnZIP Error: could not unzip archive" error window popped up. ???

Sketchup Pro 2023
I've installed LibFredo6, I've installed Sketchucation. I've got Curviloft and Roundcorner loaded and usable. When I download and attempt to install FredoCorner I get an error "failed to install FredoCorner..." I can see the extension in Extension Warehouse but it shows no author or other information. I restarted Sketchup and my PC multiple times with no change. Any guidance on what I'm doing wrong?