Done so many I can't count them all
but what I will say is, it is almost insane to go from 3.0 to 4.2 without first pausing for a sec at 4.1.
the reason for this is if you find something that you missed when you are upgrading to 5 you are either restoring data next or re-copying it as you can't get back in to fix it.
If you just upgrade the system manager and core module on 1 pc to 4.1 16bit and something doesn't work you are still in the data, and you can fix it right then and there. you don't need activation codes, just a 30 day grace period is fine
once you get the core module data to 4.1 you can uninstall all the accpac modules from all the workstations and install Version 5.0 or 5.1 and the data should upgrade without problems.
Plus Computer Solutions Ltd.