add this to your WB arguments in MO: --no-uac . There is a space before. Then visit https://discord.gg/gzwrjg to get the latest build and help test it.
Just FYI, the latest Dev builds are very stable. A lot of people are contributing and much progress has been made. About the only issues now is getting external apps to run correctly, ie Wrye Bash, xEdit...
Ever since SKSE64 came out MO2 crashes after a play thru with "memory" and read/write errors. It did it before the Creation Crap update. MO2 doesn't play well with "external" programs as we all know. But it's still better than NMM...
Shouldn't the path be ?:\Mod Organizer\mods\FNIS Behavior SE V7 0 Beta\tools\GenerateFNIS_for_Users\GenerateFNISforUsers.exe ? Just wondering. I have the latest build, and have no problems with FNIS.