lord.nitos.
If you check properly, you will find out that thread was posted on Tue Jun 15, 2010. By that time, vBulletin5 was not even released.
vBulletin5 has a completely different table structure, meaning the migrations from older vBulletin versions will not work.
Thanks for your help tho!
Edit: vB5 is not supported on the current list of convertors:
viewtopic.php?f=65&t=1641375