When you install a plugin like Round Corner via ExtensionStore, the tool doesn't just place a file in a folder. It often checks for and installs essential libraries (like the famous LibFredo6) that the plugin needs to run. This automated process saves users from the manual (and often error-prone) task of hunting down and installing several supporting files.
Do you need help to fit the new architecture? extensionstore v3.1
Packaging and distribution
Search for, filter, and discover new plugins without leaving SketchUp. When you install a plugin like Round Corner