A:AnswerThe short answer is yes and yes. This is the non-subscription version of the PowerDirector software. The EULA says you can make a backup copy for your personal use. With that said, if you have an issue with a PC that you have installed it on, you can always reinstall it on the second PC.
And for the screenshot question, yes you can. In fact, that's one way to make a freeze-frame in a video. Video playing: Screenshot for the freeze: Video continues playing.
A:AnswerVideo length will depend on the size of your storage drive and the format that you use when you produce the video. The software itself has no limitations on length.