Certain file types, like .exe files, are blocked on InfinityFree for security and fair usage limitations. Regular website files are allowed, but other files may be blocked.
If you would like to offer something for download or embed a video in your website, please use a specialized file sharing service or video streaming service for that instead.
OK, that explains. Googling the error message tells me that this message is generated by WordPress. This is not a hosting restriction, it’s entirely a security constraint within WordPress.
This article I found lists a couple of other options you could try: