Erase an old cab, or icon?

[Ryum]

I put geny dualboot on my phone yesterday, and I went to take it off today, but on the start menu the icon for this program is still there, even though it doesn't work

I went to reinstall it, and it throws up the prompt that the previous version will be uninstalled. I hit okay, and then it says it can not be installed.

Any advice?