MainStage 3.5 and Logic 10.6
All of the products by That Worship Sound are compatible with the most recent releases of MainStage 3.5.1 and Logic Pro 10.6.1
As always, do not update to these newest software versions until you can verify that all of the other music software (plugins etc) and hardware (interfaces, keyboards etc) you use on a regular basis are compatible. If you do want to go ahead and try the new MainStage or Logic Pro, update responsibly by having a backup of the older version. Check out our support page on this topic here.