I don't know how long ago that was but I used it about 10 years ago and I remember having to wait 5(?) seconds to launch a program because you had to pay to remove that restriction.

Came here to say that. Though I vaguely remember them trying some paid options even before Sophos. I recall using Sandboxie on Windows XP and Vista, back then it was incredibly useful to have such a tool.

It was definitely paid software when I started using it back around 2012. There was a lot of uncertainly earlier this year when they stopped accepting orders without notice. Existing users could not renew their licenses and people were worried that the program may just be discontinued for good. Is quite fortunate that things turns out for the better.