Question about Instant field checker (registration)

[thecore762]

I found this mod: ajaxReg - Ajax Registration, with instant field checking.
https://vborg.vbsupport.ru/showthread.php?t=144869&highlight=instant+field
But the problem is, its no longer supported, and the version seems like its buggy for everyone with the new vB forums.
So, I was researching the forums, but I could not find an alternative mod like that.
Anyone got any suggestions?

[FreshFroot]

try searching again.. there is one for 3.7. I'm using it myself, I don't have a link on me. But mines works fine and it was updated.

I think it's called something else, though it is a AJAX register checker.