oh snap 1.11 thats way oldschool
you need to go to ids website and download the 1.30 point release and install it (somewhere other then your origional release-i seggest creating a folder called games under your c drive if your on anything lower then vista) then take the contents of your old baseq3 folder and dump them into the same folder in the 1.30 install and create a shortcut to the new quake executable on your desktop and you shouyld be golden (its been a way long time so if i got anything messed up let me know)
by the way there is a newer 1.32 release for quake but its more trouble then its worth and its not what the cobra server uses so if you install it you still wont be able to connect to our server so make sure you get the version 1.30 release and not the 1.32
theres a version switcher out there somewhere too but its hard to find and it can be a little too buggy for the non tech savvy
my instructions (unfortunately) should be about the easiest way to get you where you need to be
******EDIT*****
hey i went ahead and got the ftp address for id software for you so just follow this link to download the point release you need
ftp://ftp.idsoftware.com/idstuff/quake3/win32/old/
also i dont think we should discuss where and how to download warezed software on this forum (sends nathen a fatherly scowl) if your using pirated software its your own biz but lets not discuss or encourage it here
******EDIT*****