I also just purchased a Line 6 Amplifi 150. I finally figured out which patch to download and how to install the updater on my Android O/S tablet. That took a couple hours, so not too bad. It took a couple days to figure out how to get the 25 banks of factory presets but basically all I did was reset the amp to the factory settings and the presets automatically downloaded. Now the only glitch I have to fix are the jam tracks. I have the same issue as the postings above, I get the Demo jam track but nothing else.
I followed the instructions of Line6Tony of November 2016. I crossed my fingers that I wouldn't lose all of the progress I had made so far. I did not lose anything but the suggestion of Line6Tony did not solve the problem either. Are there any other suggestions out there? Is the only option to contact IT support?