Clickteam does officially offer a "portable" (standalone .exe or no-install) version of Clickteam Fusion 2.5.
Instead of looking for a portable version, which may lead to insecure or unauthorized files, you can access legitimate versions through the following channels: clickteam fusion 25 portable download
However, the built-in documentation is notoriously dry. New users will likely find themselves scouring YouTube tutorials and the Clickteam community forums. The "Portable" aspect doesn't hinder this—you can access the online community just as easily—but it highlights that the software assumes you have some idea of what you are doing. Clickteam does officially offer a "portable" (standalone