Quake 3 arena instagib rail jump mod

Hello!

Me and my friends are planning to play quake 3 this Friday. We wish to play instagib mod with rail jump in dedicated server. I managed to make instagib server with osp but I haven't been able to enable rail jumping.

After googling for a bit I found out that osp doesn't support railjumping and I need Instaunlagged mod. Unfortunately I haven't been able to find a secure download for this mod. Can anyone help me with this? :)

Thank you!