Hi so this game is a .exe file. Are you on a mac maybe? To open exe's on a mac you have to use a program like wine bottler to open these files. If not here is how you can play the game:
unzip the Solm_v2.zip file which should open a solm.exe file.
Run the solm.exe file which will then extract a folder called Solm with a bunch of data in it.
Open the Solm folder and run the Game.exe file.
(sorry it's so complicated but that's how rpgmaker exports their game files. I hope this helped!)