I would not take roton's approach. Patching up from the previous chapter tends to lead folks down a dark path of destruction which ends up with long long patch downloads, even longer install time and in the end, bubkus.
What you could try, since you seem to be stuck on 1 particular patch, is to try an alternate patch download that the EU mentor keeps. One of their forum mods (not a GM, just a helpful person noted with special rank as Mentor) has been providing for them links to alternate sites for downloading for those who run into a bad patch file in their local caching server.
if you go to their manual patch thread, the are alternative links to megaupload for most of their patches.
https://forum.runesofmagic.com/showthread.php?t=79267
T