New classes will soon be prefixed with "SPU"
I still need to look into adding a compatibility layer for -updater:willInstallUpdateOnQuit:immediateInstallationInvocation: and possibly deprecating no-DSA instead of outright rejecting it.
We don't export an API for configuring this in SUUpdater.
Messing with the user defaults is not ideal, and we don't use hasLaunchedBefore anymore
For testing this, the user defaults should just be removed manually, and the test app should be relaunched.
This option never used to work for me that well before anyway.