This is a free utility that scans your installed software for CD keys. If muvee Reveal X is currently installed (even in trial mode), the Keyfinder might extract the key for you.

If you just need to export one video, the trial version of Muvee Reveal X typically allowed full editing but added a watermark. Since you can't unlock it, consider screen recording the preview (though quality will suffer).

A Quick Cut for Casual Creators. Muvee Reveal works best as an automatic video editing tool for users who value speed, simplicity, muvee Reveal Review - Automatic Video Editing Software

muvee Reveal X is a highly automated video editing software designed for users who want to create professional-looking movies and slideshows quickly without learning complex manual editing techniques The DIY Video Editor