Spine prompts for the activation code every time it is run. If you enter the activation code, it is stored and Spine won't prompt again. You can logout in Spine's settings to cause it to prompt again. You can also logout from the command line, eg:

Spine 

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logout

Please send us an email and we can check on your specific license: contact@esotericsoftware.com

greden wrote

First of all - @Spine prompts for the activation code every time it is run. - it's not true - i have three pc, which open program without activation window
Second - i didn't type activation code, because on these problems PC i didn't see it.

Yes, that's exactly what it is stored and Spine won't prompt again means (:

greden wrote

Second - i didn't type activation code, because on these problems PC i didn't see it.

Do you mean since the first time you run the program?

greden wrote

Third - @You can also logout from the command line, eg: -where and how can i use this command?

if you're on windows 10 you'll have to:
1.right click on the start button

2. choose Command Prompt
3. a black window will appear, in this black window type: cd C:\Program Files (x86)\Spine (which is the folder where Spine is installed in my case, if it's different, type the correct path)
4. press enter, this made the command line change directory, so now you can execute Spine. Type: `Spine

logout`

5. press enter, and this will have logged you out.

greden wrote

Fourth - Can you describe the easiest way to activate program? you know like in every other programs!

Double click on Spine.exe usually. Then you paste the activation code in the window that asks for it that opens after the double-click. (;

For future readers, the problem was the Spine Trial was being run, which never prompts for an activation code. The full version of Spine is a separate installation (though both can be installed at the same time).