To all people with this problem. I have worked out a way of logging on. Using Giraut's technique of transfering files from .019 to .020
here, you can transfer the old maps and run the game normally. Even the new lightmaps still work.

Only transfer the old maps such as "Hydlaa_Plaza" and "ojaroad2", don't do the rest of what Giraut says unless you need -fullbright.