[DaltonST]

Since you manually copied entire C:\Users\Tanjamuse\AppData\Roaming\calibre folders from your old PC to your new PC, it is possible that you corrupted the Windows 10 security permissions, so nothing is getting saved. If so, you must fix them.

See the attached image. Run that. Save your user ID first as "Administrator". Let it do its thing. If that does not work, save it first as "Other - Administrator", and then save it back as just "Administrator". If you get it to reset itself, Windows will tell you that you must log off and then back on. That is a good thing. Just ensure that there is another Admin user already created in case you accidentally remove yourself from the Administrators Group just before logging off.

The point of this exercise is to get Windows to "reset" your username as an Administrator even if it was already "Administrator". Also, remove your user name from the User Group if you belong to it too. Just belong to the Administrators Group.

Also, change the shortcut you use for Calibre to always Run As Administrator to ensure that variable is not the cause of your problem.


Added: I looked at your uploaded Job Spy.json file, and it has never been changed by you...at all. That means that my concerns about your having the proper security permissions to save to that folder may have a valid basis. Manually copy your .json file from your Old PC to your New PC, and then verify that it copied properly. If Windows will not let you do the copy...see above.