Retroarch ParaLLel Core
When the ParaLLel core from Retroarch is chosen as the N64 emulator, Dig seems to think that it is not installed when it actually is. I am using the latest Nightly of Retroarch as of this posting.
I am not using the 64-bit version and that option is not checked. I'm not sure what else to include that would be helpful for troubleshooting.