Welcome to the forum!
Personally, I would avoid the App Store version, unless you don't have any other choice. We can help you troubleshoot whatever went wrong with the other 2 versions, if you like.
Note that the first time you open Inkscape after installing it, it can take up to 5 minutes to open. Or more, if you have a lot of fonts. So first I would suggest opening the version which you're sure was installed, and give it a few minutes to open.
Let us know what happens, and we'll go from there
