Comment to Update from 11.0.2 to 12.1.0 Not Working
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Enough of our sad story!
- Is Cron necessary for update?
 - Does the update change DB tables substantially? (As mentioned very little content just need to keep sys_accounts and reactivate them.)
 - If not, can I install v12 and connect to old DB
 - NOTE: I have installed v12 to subdirectory just to test server plays nice, but I haven't tried cx to old DB.
 - Can I just import sys_accounts to new DB on the v12 clean install?
 
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Let's review your story:
- Is Cron necessary for update? Yes!
 - Does the update change DB tables substantially? The usual situation with it.
 - If not, can I install v12 and connect to old DB. No!
 - Can I just import sys_accounts to new DB on the v12 clean install? You may try but don't forget about sys_profiles and bx_persons_data tables too. But this is not the proper way anyway :-)
 
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@LeonidS Thanks again, I'll see about following protocol (cron setup first) and then proceed with update via dashboard. BTW good to know about those other tables for future troubleshooting. I owe you pint!