SaT licence not working on second computer

[Akerman161]

Hello,  SaT not working on my laptop, getting message: https://prnt.sc/n-Q1DqnJ9mLG
Last week all was fine but now i can't use SaT even then my first computer is off.
Can someone tell me how fix this problem?

[SaT_Admin]

Email me from your paid registered email addr

support(at)stackandtile(dot)com

Then I can look up your account and clear this out

One other guy had this happen recently, I'm not sure if something broke somewhere. Just make sure to press Stop in SAT on the first machine before pressing Start on the 2nd