I have a problem too. If i install a forge version and load it to launcher, it will show up in profiles and i can set it up. However, when i try to run it, it crashes. I have tried 1.8, 1.8.9, and 1.10.2. In their file folder, each have a .json file, but the only one that works (1.7.10) has both a json, and an executable jar file that allows minecraft to run the version of forge. What can i do to get 1.10.2 jar file?