Are you sure you’re meaning Application Mover (fundac software)? I’ve used it and had problems with it.
But, I’ve not had any issues with PC Mover by laplink.
As with anything, YMMV.
I mean PCmover.
Moving applications is a tough thing to do. Many have tried, none have succeeded in creating an app that handles it well enough for the average user.
‘Upgrading’ your operating system can be fraught with problems, large and small, some of which will lay dormant for some time before being revealed.
With the millions of lines of code involved it is best to give your operating system a fighting chance with a clean install.
You probably wouldn’t want to use the phrase ‘Murphy’s Law’ and the word ‘computer’ in the same sentence. That would be redundant.
Spend your time and money on better things. Do a clean install and create a recovery disk. You’ll be glad you did.