Gridcoin Research 3.5.8.7/MSI=42.1 Mandatory Upgrade

From Cryptocointalk forum

Gridcoin Research 3.5.8.7/MSI=42.1 Mandatory Upgrade - 

Added checkpoint at 850000 - Enforce beacon age; beacons over 6 months are discarded network wide. Beacons may be re-sent without restarting if they are expired. - 

To sync: From the command line on windows: grcrestarter downloadblocks. 

NOTE ** We still need 51% to upgrade to stay in sync. After block 855000, clients enforce the mandatory upgrade.