So it's: install--->activate---install--->activate NOT install pt1--->install>pt.2--->activate. Thanks!
Step 1: Make 2 seperate FOMODs- 1 for part 1 and 1 for part 2.
Step 2: In FOMM package manager, activate part 1 then part 2
Step 3: Make sure the FWE .esm, and the FWE ,esp's that apply to your game (ie DLC esp's, etc) are checked in the main FOMM window. Read the readme to see which esp's can be used together!
Step 4: Apply (or toggle off then on, if you've already applied it) ArchiveInvalidation from the "tools" drop down menu.
Done!