Cannot start demo

I wanted to try skatter before buying, however I could not start the demo. When I wanted to activate the 15 days trial after entering the activation code, an error occured that says I have tried the demo before and I must buy the program but I had never tried or installed this plugin before. now when I uninstalled and installed again, this time directly says I have used the demo. What can I do for trying this plugin?

Did you use the offline activation?

yes, I think clicked offline activation and after that clicked again to get serial number or smth like that so It said It’s already used but I cannot.

Why did you use the offline activation? The “Start free Demo/Trial” button wasn’t working?

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