Install ShipPress
ShipPress is a Mac app, signed with an Apple Developer ID and notarized by Apple, so it installs like any other Mac app.
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Download the right file
Download for Mac on this page is ShipPress-mac-arm64.dmg for Apple silicon. The arrow beside it also offers ShipPress-mac-intel.dmg for Intel. Apple menu → About This Mac: “Chip: Apple M…” means Apple silicon. Anything else is Intel.
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Move it into Applications
Open the downloaded .dmg and drag ShipPress into the Applications folder.
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Open ShipPress
Open ShipPress from Applications or Launchpad. The first time, macOS may ask if you want to open an app downloaded from the internet; click Open.
Once it opens, the chat is on the left and a live preview of the site is on the right.