I have a 2016 macbook pro with high sierra and there appears no way to download an older version of macos for testing on another machine? I have to test an app that will hit an aging user base with old machines.
Is this for real? Everything I can find on google is saying to go to Purchases in the app store but it won't let me download them on this mac. The only thing listed on the Apple developer downloads page are incremental upgrades.
What is going on?