Forge works on J16, you just have to specify the necessary opens arguments to get around the reflection lockdown.
Because those arguments require editing settings in your launcher, and figuring out all the areas Forge and Mods reflect into, it's not something we actively support.
Either use jarfix, or set your file associations correctly. You're gunna have to google how to do that based on your operating systems.
jarfix tries to do that for you automatically.
Also, don't bump old threads.