To be honest Harvest Map has LibMainMenu as an embedded library and upon examining it with version 8 from ESOUI you would see it's the same version functionally.
If you went to go to .\Documents\Elder Scrolls Online\live\AddOns_org\HarvestMap\Libs and remove the embeded libraries Lib3D, LibAddonMenu-2.0, LibGPS,
LibMainMenu, LibMapPing, LibMapPins-1.0 and installed them separately that would help.