I updated RTMPExploreX to version 1.1.
You can find it under the same URL:
https://github.com/andr3jx/RTMPExploreX/downloads
Now you can use another port than 1935 without problems. If you choose an other port it uses a portfowaring tool (command line utility) and redirects the connection to 1935. Moreover it uses the process names of rtmpsrv/-suck to detect if they are running instead of cmd.exe.