Are you referring to the Adrenaline Gamer mod? If so, then it's just not one that we support on our order page, so we would not be able to help you to install it on one of our game servers. Most companies would do the same -- so it's not actually "unlike any other place".
If this is actually on an unmanaged VDS, you'll need to install it yourself, according to their documentation. If it's like other HL1 mods, you'll mostly just need to upload the files. We do our best to answer software questions about unmanaged VDSes/machines here: viewforum.php?f=44