So I went to download and install McSolitaire thinking it might be a fun game. Well, something went wrong during the install process. Now I've got a half-downloaded app in my Applications and the Purchases tab encourages me to re-install it, noting in red that an error has occurred. Deleting the app from Applications and returning to the App Store causes the app to reappear in Applications, still with the small slider indicating still copying.
At this point I just want it to be installed or gone. I don't really care if I play Solitaire using the app.
What do I do now?
Some screenshots for the discerningly minded:

and

Clicking install says:

and below that ...
