Windows Vista upgrade kit for windows 7 does not work

OK, I have an older computer (Acer X3300). I was running windows 7 ( upgrade from original Vista to 7 with the upgrade kit)....but I was experiencing problems so I had to flatten my system ( I guess it was a worm) and start the system recovery. I managed to get Vista back to status SP2 including Internet explorer, all running fine (Microsoft essentials does not work anymore as it is no longer supported, but I have other firewall and antivirus active). Then I wanted to use the upgrade kit again to repeat the upgrade to windows 7 ( I need 7 to use photo editing software). But, it does not take it anymore. I used the Windows 7 upgrade ckecker which told me that the uprgade kit is not up to date ..... it worked years ago, but not anymore... why? My PC is still running and I would not want to desperately buy a new one now. Is there any working link to actualise the old upgrade kit? While trying to install the kit hangs itself up while searching for upgrades by the way. I guess all too old?

When windows 10 came out I was not allowed to upgrade on my upgraded Vista version to 7. Windows 8 was required. Can I upgrade Vista SP2 to windows 10? If yes, what software package do I need to buy? I guess again a new PC comes cheaper.

Additionally, I am also running Ubuntu parallel to Vista. Could that be causing now a problem to upgrade to 7? Well, I had it before and it worked, but maybe because of the system recovery something changed? Ubuntu is running with no problems parallel. Thank you for answering this, greetings Sonja