ActivePresenter Portable is a fully functional, self-contained version of the popular screen recorder, video editor, and HTML5 eLearning authoring software. Unlike the standard installation package, the portable version requires no installation on your computer's local hard drive.
You are using the Free edition. Fix: Purchase a license and place the license.key file inside the portable folder’s root directory. The portable version will detect it.
If you need professional eLearning outputs (SCORM, xAPI, interactive videos) and portability, ActivePresenter Portable has no equal. If you simply need watermark-free screen recording, OBS Portable is better.