I downloaded the full version of C4 off the main site yesterday and unzipped it. I had a few problems like mentioned in this post (http://boards.lineage2.com/showflat.php?Cat=&Board=gentech&Number=514578&page =0&view=collapsed&sb=5&o=&fpart=all), but it eventually worked with the unzip built in windows. Halfway through installing, I get a message to insert disc 0. I do not have any discs, and I do not see why I should need any since I did a full download.
So without this "disc 0", my installation got canceled. I figured I would go back and just patch from C3 to C4, but it appears my lineageII.exe file got messed up, so I can't even run the patcher.
I tried putting that in my L2 folder, but I get the message "This application has failed to start because PATCHW32.dll was not found. Re-installing the application may fix the problem."
I also tried downloading the full C4 PTS, but I crash trying to unzip it.
No patchw32.dll either. Since C3 looked like it was beyond repair, I redownloaded C4 and got a copy of winzip version 10 (since I had trouble unzipping the C4 PTS file, I figured this might be part of the problem). It installed smoothly and I'm now playing C4. So if anyone else runs into the same problem, try that.
P.S. C4 rocks - I've been able to run it on max graphics settings and haven't had any evil crashes... yet.
And special thanks to Splatter. It's great that someone replies to all these technical issues on the board. ^^