I reformatted my computer and redownloaded Scriptplayer, but when I try to run the installer I get a pop up saying I need the right program/software to run the file type. ISS file
the installer should be an exe not ISS, can you try using this installer, this is the latest release from their github:
https://github.com/FredTungsten/ScriptPlayer/releases/download/1.2.1/ScriptPlayer-1.2.1.exe