As a subrule of The Lines, create a rule called “Downloading a new Stratum” with the text:

A Runner may Download by privately informing the Gridmaster that they are doing so, and that Runner is considered to be Downloading until the end of the next Tick action. If a Runner has Executed since the most recent Tick, they may not Download. If a runner is Downloading, they may not Execute.

In Running, replace the bullet point “If no Cells have a value of Battery, Load a new Stratum” with:

If no Cells have a value of Battery, or if the number of Runners that are Downloading is greater than 50% of Live Runners, Load a new Stratum

In the same rule, replace the bullet pont “Post a blog entry announcing the new Watch Number, and announcing any Runners whose Locations are cells in the Alpha Sector.” with

Post a blog entry announcing the new Watch Number, the number of Runners that are Downloading, and announcing any Runners whose Locations are cells in the Alpha Sector.