Slitherine

Hello to all the people of this fantastic forum!. I play this game for 3 long years, I have uploaded videos to youtube, but today I encounter a problem...
The reason for this topic is that I have a problem with the update.
After installing the 1.6.6 update, when I run the game an error message appears, the error message is this:
"Serial number mismacht. Please re-instal the game"
I guess the serial is the problem, but never before had I gone something like this.
if anyone can help, of course I would appreciate it.
And sorry for my English, I do not speak it very well.
Thanks and greetings from Argentina..

back up your saves, uninstall and reinstall the game, then add the last update and see if it sorts it for you, as it seems you have a faulty install

problem solved!!
apparently the antivirus blocking something in the installation, after reinstalled the game many times and tried many many things... I finally occurred disable antivirus and it worked! ..soo let's play
thanks for your reply! I very much appreciate