Kept digging and searching posts on the forum. Found this: 500 Error log shows Column not found: 1054 Unknown column 'classification' in 'field list' - #22 by tonyyeb
I tried running the migration on my host but was getting:
So I knew I was on the right track. Checking my PHP settings, the missing function wasn’t listed, but then cPanel seems to have a ‘disabled_functions’ setting on the second tab of PHP options. escapeshellarg was listed there, so removed it a re-run the migration.
All good now, and can create Vendors and Clients.