Photoshop CS3 re-registration

I've spent the greater part of three days trying to re-register Photoshop CS3 after recent Windows 10 downloads

of Dec18-22, 2017, messed up what up to then, was working fine.

Yes, I deleted all files necessary, as instructed by Adobe Chat 'Milan'.

Except for the "Adobe" files in: x86 (Adobe - and in - Common Files) because system did not allow these to be deleted.

I used the Adobe Cleaner Tool,

I got my NEW serial number - which i don't know why the one that came with my CD could not be re-used.

I deleted the 'cache' (I found this out on my third try of undergoing this process)

I re-downloaded the product from the CS3 product download.

Thought everything would work well  when i got a message to enter my Serial Number (which Milan said should be the NEW serial number)

Pressed: Enter

Message: "Unable to Connect to Adobe to Register"

I consider this ordeal a conspiracy.

"Chat" was a waste of time as the problem did not get resolved, only to be informed that if issues

continued that I should post it on this forum (more time wasted).

To the Powers Be: I paid for my software outright, at a time when subscription was not an option.

As it stands, CS3 maybe an older version but it suits my purpose and as it stands I have the right to use it.

I'd appreciate a working solution and or a contact actually knows how to solve this re-registration issue.