AutoTools Not sure how to buy the license

I just found the answer to my question: the autoApps program. I didn't realize that was how you have to buy the companion apps. It should probably be made clearer tbh! But anyway I love Tasker so far and its power and flexibility. Thanks for making these apps.

Original message:

I downloaded autotools from the google play store on my S8, but when i tried to use it, it tells me

App locked. Please start the trial or unlock the full version.

But I don't even see a way to do that. Not on the play store or in Tasker. Please help.

Also, is it a one time purchase or is it a subscription? Help please!