small issue i found today - i was finally installing some titles to my kids Wii U and when your application downloads the updates it uses (vXX) for updates. this causes wup installer y mod to freeze after installation.
i confirmed this by installing a title with (vXX) and it froze (Mario Tennis update file) and then installing it without the (vXX) and it progressed fine.
its not really a bug in your program but it does cause a headache if you don't know this or can't figure it out
having the parenthesis isn't really a huge deal so i would suggest to simply remove it or put in braces since they work fine with the installer. it is a real pain in the butt when you have to install 10 updates and each folder has to be renamed individually.