Just purchased the LG G6 coming from a Samsung Note 5.  Installed Quick support to remotely control my phone (Authorized 3 channel user of version 12).  Was working fine with with my samsung.  Aftger install the QS it asks to install the (QS add-on: LG and downloads it but then install fails with  "Can't install app Error -504".  I tried a bunch of the troubleshooting tools offered up by google with no luck.  I'm at a loss.  I'm assuming it's due to being a brand new phone.  i was just wondering how I go about getting this working?