I updated to the 1.1 version of DietHopper and got a crash when starting up. I was able to start after downgrading to 1.0.
crash-2017-10-05_18.05.08-client.txt

The bug appears to be that he is relying on code that does not exist in 1.10.x version of Forge. The solution is to downgrade to 1.0. Version 1.1 on CurseForge should not have the 1.10.2 tag on it.

When I saw the exception I tried upgrading the pack (Homestead) to the latest Forge (1.10.2-12.18.3.2511), but still got class not found exception.