MainStage does not allow two versions to coexist easily. If you have MainStage 3.6.6 installed, drag the old app from the Applications folder to Trash before opening the DMG.
Never download this file from a public forum. Extract it from your own Time Machine backup, or accept that upgrading to the current App Store version is the safest, most sustainable path forward. Your live set is only as good as your software’s integrity—don’t gamble with a sketchy DMG. MainStage-3.6.4.dmg
MainStage does not install all its massive library (approx 30GB+) at once to save space. MainStage does not allow two versions to coexist easily
For decades, the line between a studio recording and a live show has been blurring. Musicians no longer want to drag heavy amplifiers, racks of effects processors, or bulky synthesizers to gigs. Instead, they want the power of a professional recording studio in a single laptop. That’s where Apple’s comes in. Specifically, the version referenced by the file MainStage-3.6.4.dmg represents a sweet spot in the software’s evolution—offering stability, classic compatibility, and powerful features for the touring musician. Extract it from your own Time Machine backup,