Hello,
Q-1 You should be able to upgrade it via SAINT. You are on higher release. Did you get any error in SAINT?
Q-2 What is the current release of GRC add-on installed on the system?
Q-3 In a new installation, only Central Application usage (SAP_APPL & EA-APPL) comes on 617 level and rest are on 600 release. You have to upgrade SAP_HR and EA-HR to EHP7 using SUM.
Thanks,
Sunny