1.17.11

I didn't ask for the new upgrade to 1.17.30. It messed up my worlds. I don't like the new look at all. They terrain does not look more real. It,s boring. I like 1.17.11 because the mountains were beautiful with trees, flowers and snow caps. Those were real mountains to me. I want to go back to 1.17.11 I've got all my worlds in a back up. I have windows 10 version: bedrock education edition. (I also recently downloaded a thing called my own server, (own minecraft again.) but from the minecraft website, if you ever heard of it.) Can you please help me? I spent lots of money to play this game, and hours, months of my life. LOL! I don't know what lancher to get for this. I downloaded TLauncher and it didn't work right to downgrade my version. So once someone explains what to do can you also tell me how to prevent future updates.