- You must unlock your bootloader via fastboot.
- You must have a custom recovery installed (link below)
- Fully wipe your device from Recovery if you are not coming from CM13.0 already.
- Flash the downloaded ROM (link below)
- Flash the Gapps (link below)
Don‘t flash gapps after you booted up CM 13! This will kill your device. If you want gapps, then flash it right after you wiped your phone and flashed CM 13.