Minecraft Forge 1.7.10 stops working (2019)?

The versions 1.8+ all work with mods! But when I start Forge 1.7.10 and go into a world, Minecraft crashes! Whether I have installed mods or not! If it crashed, the error message says, "It looks like you're using an unsupported, modified version of the game."

I can't help it and would like to see my old worlds! But that does not work! Can someone help me?

Delete the version times and download the new if not google then the error text is there

Can you send me the crash report here?

Have to look after the individual, with me diversity mod has caused quite a few mistakes. Otherwise Googling error report, sometimes you have to take small changes from program.

Do you mean the complete crash report? Or what?

I have deleted them and now it is before the 1.7.10 Forge versions (unavailable) before! Except for an older Forge version and there remains the problem with the crash!