Hello my user content and plugin destinations did not save, and importing user libraries lost my user icons.
However I found this data is stored in C:\Users\[User]\AppData\Local\Native Instruments\Maschine 2
plugin.data has your plugin destinations
komplete.db3 has your icons and library destinations
copy them into (and don't forget to back up the previous files in there)
C:\Users\[User]\AppData\Local\Native Instruments\Maschine 3
- it worked but have only had minute to test it so I don't know if it'll be buggy, so be warned
apologies if this has already been said.