IMHO the upgrade & module loader didn't seem that mature until 3.5.1c. I never did a comparison of the code to see the actual changes Sugar made (so this may all just be in my head), but I gave up on trying to use the admin tool for a,b,c upgrades from 3.5.1. I just ditched the whole process and did a re-install at 3.5.1c. The upgrade from .c to .d was seamless.
Sometimes a db dump of the data with full inserts and a reinstall is just quicker...
If you want to continue your quest, I might be able to help if you post your php error logs and sugarcrm.log tails while you are attempting the install (set your sugar logs to at debug or all in log4php.properties):
Code:
log4php.rootLogger=debug, A2
Mike
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