• For Catalina and earlier, do OS validation only as far as the minor release. This allows for the mismatch between advertised build and DTSDKBuild (fixes Issue #53).
• Fix for when VolumeName is not Macintosh HD or any two-word name (fixes Issue #58).
• Added exit 1 code if script exists due to not successfully downloading an installer (fixes Issue #52).
• Increase munimum disk space required to 30GB, which aligns better Apple's recommendation for macOS Big Sur (see HT211238).