For anyone whose game opens as a black screen and then closes, these steps worked for me for both Opala 1 and 2
1. Download RPG Maker XP from "Installation" section link (File is named xp_rtp104e by default)
2. Install to default location -> C:\Program Files (x86)\Common Files\Enterbrain\RGSS\Standard
3. Open the Game.ini file in your game folder (the one with the gear symbol)
4. Change "Library=RGSS102E.dll" -----> "Library=RGSS104E.dll" - Credit goes to indeedsmug
I do get a hanging script error (don't know how to fix) but I just reopen the game until I get to the menu. I don't think it's caused by step 4 though because I haven't gotten this error for the first game.