When I try to start RoM, A error pops up saying
http://rom-eneu-patch.runewaker.com/patch/:80 version.txt fail!!
What do i do!?


1) Post things like this in technical issues instead of here. You are not discussing ROM, you have technical issue to resolve that applies to you only.
2) Does your download.txt look ok? It should have a bunch of entries for each patch, like this...
[4.0.6.2481.en]
DownloadPath=en
Version=4.0.6.2483.en
DownloadFile=patch_4.0.6.2481.en_4.0.6.2483.en.exe
MD5=9323767c13211b7674d486034b3a4b8e
3) Start ROM with "client.exe NoCheckVersion" so there is no version checking, if version checking is the root cause of startup problem.