Hi,

I manged to upgrade without issue to version: 4.3.3

When I try to do the final upgrade I get this:

Your browser sent a request that this server could not understand.
Additionally, a 400 Bad Request error was encountered while trying to use an ErrorDocument to handle the request.

Hi
Kindly take a full backup of the site and share site details in Private reply by editing the first post.
Edit the first post submit site details for staff/Mods.
I will check it.

Regards