Note: ensure you are running the latest version of DSM is 6.2 and that Python 3.5.6 is installed, also good idea to complete a reboot before installing any packages.
#1. Log into your NAS as administrator and go to Main Menu → Package Center → Settings and set Trust Level to Any publisher .
#2. In the Package Sources tab, click Add , type SynoCommunity as Name and http://packages.synocommunity.com/ as Location and then press OK to validate.
#3. In the Package Sources tab, click Add , type SiCKRAGE as Name and https://synology.sickrage.ca/ as Location and then press OK to validate.
#4. Go back to the Package Center and install Python 3.5.6 and Git packages, then SiCKRAGE package from the Community tab.
#5. Wait for installation to finish then access WebUI from port *8899