Upgrade to 10 second try.

1. I have upgraded a modern up to date PC from Windows 8.1 to Windows 10....all OK.
2. I have upgraded a modern up to date Laptop from Windows 7 to Windows 10....all OK

I tried to upgrade my second PC, it is virtually identical to the first PC (1) except for the software set up, but had to roll back to Windows 8.1.
They both have an SSD for programmes and a HD for storage (Pictures, Music, Docs etc)

Can I now try to upgrade again as I believe 10 is still on the PC?
Can I also try after the cut off date as it is on my PC?

Thank You:)

PS. I do take disc images as required (AOMEI).

I have now upgraded the machine and got to a reasonable 'no return' stage.

Thank you:)