Installation Error

This development site was created via FTP transfer from a different server. I had access to the Starter Templates library on the old site/server, but the plug-in is not installed in this new development environment. I’m not sure what I need to delete from the directory tree to remedy the following error message, received during my attempted installation:

Installation failed: Destination folder already exists.

I would appreciate any assistance you can lend.

I’m reluctant to delete any of the Astra folders since the site under development is using Astra as its theme.

Looking forward to your response. Thank you.

The page I need help with: [log in to see the link]