Check the current Archive, all Files included there are needed for ibProArcade.
If you have others, remove them.
If you want, you can alter the included HTML-Files, they just are there for security reasons so that nobody can take a look in the ibPro-Directories, feel free to change them however you want.
This in fact
is the legal release of ibProArcade that uses no copyrighted PHP-Files from InvisionBoard. Beside this should be a fact to Upgrade old ibProArcade-Releases, this one already contains alot of additional Feature, is bugfixed alot and even has new features included. The AdminCP is completely rewritten to fit vBulletin-AdminCP.
So what is the problem ?