I've been working on a large build within single player and switching between Optifine and forge 1.12-forge1.12-14.21.0.2362. Since the newest version of Optifine came out I wanted to start working in that profile to work on my build, problem is going back to thinking about forge I realized that its not on 12.2. came back here to download the latest forge and I'm still getting a message saying that if i attempt to load the world in an older version it could corrupt my world. Just not sure what to do from here since I'm not technical savvy and would need a "forge for dummies" book explanation. I've attached a couple pictures to maybe help explain what I'm talking about otherwise I do apologize in advance if I cant clarify future answers. ^^;