Please note that I have not purchased any code signing keys yet (about $100/year for each platform), so you will be prompted with a warning when installing on Windows/Mac as for now.

Install on Windows

exe: Double-click on the .exe file, then click "More info", then "Run anyway". Then you are good to go.

Install on Mac OS

dmg: Right-click on the .dmg file, click "Open". When promted click "Open" again. Then you should be good to go.

Install on Linux

snap: sudo snap install freeshow

AppImage: Right-click the .AppImage file, choose "Properties", go to "Permissions", and check the box that says "Allow executing file as program", then double-click the file and you should be good to go!