First, thanks very much for releasing this hack! Been waiting a long time for something like this.
Second, I think you guys need to go back over the install procedures for 3.5 again, because it doesn't work

Any reference to fileedit.html, etc during the installation needs to be removed as they don't apply to 3.5 and simply produce an error during installation.
Second, your league admin options do not show up in the admincp. This appears to be because of a simple problem: The "cpnav_league.xml" file that would add said functions refers to a product, "league" but no such product is installed as part of your installation routine. Running "league_admin.php" directly produces a blank page.
Are you sure the vbleague_install.php file you included in the zip is for 3.5 and not 3.0? The file appears to have been cribbed from UCash .95 and vbadvanced 1.0 (there are still many references to both in the code notes) which are not 3.5 hacks.
You should really do this install as a product anyway.
Again, thanks for the effort and here's hoping we have a working 3.5 version soon