arcadeimport.php has only ever been a tool to import scores and games from v3 Arcade for vBulletin 3.0.x. From the upgrade instructions:
Code:
//=================================\\
Upgrading from 3.0.x
\\=================================//
If you're upgrading from a version of v3 Arcade for vBulletin 3.0.x, follow these instructions.
1. Make sure you upgrade vBulletin to 3.5.1 first.
2. Remove all of the old Arcade templates from the forum. To do this, upload arcadetools.php from this zip file to your Admin CP directory and visit http://www.yoursitehere.com/forums/admincp/arcadetools.php?do=clean
3. Read "Installation Instructions.txt" from this zip file, and proceed with installation as normal.
4. Run http://www.yoursitehere.com/forums/admincp/arcadeimport.php to import old games and scores.
It clearly states this is for 3.0.x only.