Samsung has today started rolling out this month’s Security Maintenance Release (SMR) to all unlocked variants of the Galaxy S6 and Galaxy S6 edge that were purchased in Europe. The upgrade itself weighs in at approximately 140MB and transports a handful of much-needed patches for both the Android operating system and the individual devices to make them more stable and secure.
As we’ve come to expect from all major and minor firmware updates, the OTA is being pushed out in stages. However, if you’d like to see if it's ready for your device simply follow these steps: Settings » About Device » Software Update » Update Now. Alternatively, you can always wait until you receive a push notification prompting you to download the upgrade.