500 errors are server errors....you need to find out what the actual error is behind that. Your hosts can help with that.
If you had attempted an upgrade to 4.2.5, make sure you have put back ALL the old files from the previous version. Also, depending on where the upgrade failed, there may be issues with the database now also.
Note that there will not be a "next vB upgrade" for vBulletin 4. Development on vB4 is now at an end, aside from any security patches needed.
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