Problem upgrading vesc tool, maytech limited time

Hello, I have a maytech 3.56 and I have been working with the vesc tool 1.16 and 1.26, the bike have been working correctly. I decided to upgrade to 2.06 but it says “limited time” and now it doesn’t works. I tried going back to 1.16 o 1.26 but the message “limited time” still appearing. Anyone knows how to solve this problem or knows what limited time means?