Sometime SAC blocks the installer when freshly released, then allow it after days or weeks, as with media player classic.
Sometimes it blocks the installer even if old enough, as the case with peazip.
Sometimes it blocks the installer, but allows the installed app to launch; here turning off SAC is useful to bypass installation block.
Sometimes it blocks both the installer and the installed app after installation; turning off SAC will permit installation, but after turning it on again, launching app will be blocked.