I have the same issue than you. Corona crashes all time. Oddly enough it started crashes at alpha 5.1 and ever since I haven't been able to use Corona. You guys should let the older versions alive. By killing them you hurt us. Buying a new machine is not a small investment.
I understand that you are willing to try an older version, because you feel that it's the only way to have a functioning Corona. But it should not be crashing for you in the first place! Can I ask you for your system specifics? By that, I mean OS version, C4D version, CPU, ...
When Corona crashes, when does that happen? When starting C4D or when doing something specific? Could you send us the BugReport.txt file?
Also, did you try uninstalling Corona and installing the newer version? Alternatively, instead of uninstalling you can erase the whole folder "plugins\corona" inside the installation directory and reinstall Cinema.