Version 3.5.8 of DropDMG is now available.

DropDMG makes it easy to create a professional disk image for your app. Disk images pack entire folders or disks into a single compressed file, either for transport across the Internet or simply for backup or archival. They are Apple’s preferred format for distributing Mac software and the only archive format whose contents you can directly access in the Mac Finder—no extraction or third-party software required.

Deliver your Mac app on a .dmg file with a software license agreement, a custom volume icon, and a precise icon layout atop a Retina-optimized background picture. Customers can install simply by dragging and dropping the app onto the convenient Applications folder link. Code-sign your .dmg so that macOS knows it can be trusted after download.

This is a free update for owners of DropDMG 3.0 that includes the following enhancements:

• The Create macOS Install Disk command works around some issues with the macOS 10.15 Catalina installer that could cause errors or the creation of incomplete installation disks.
• Create macOS Install Disk automatically shows you the volumes list when it’s time to select the destination volume, saving you a step.
• Updated the Create macOS Install Disk and Signing sections of the manual.
• When calculating the size of the source folder or app, DropDMG now counts the sizes of any extended attributes. This fixes a problem where some apps (e.g. those made using the Qt framework) that include large numbers of small code-signed files wouldn’t fit on the disk image.
• Work around a series of bugs in macOS 10.15 that sometimes caused a “Resource temporarily unavailable (-54)” error when creating a disk image with a license agreement.
• Worked around an issue with macOS 10.14 where the log detail drawer might be slightly too short to fit all of its contents without scrolling.
• If you have a disk image with a pre-existing license agreement and convert it with None as selected license, on macOS 10.15 the license is kept rather than deleted. This is due to a pair of bugs in Catalina (FB7362946, FB7362950).
• Fixed a crash that could occur if there was an error creating a macOS install disk.
• Fixed a bug that could cause a crash when a Software Update error occurred.
• Fixed a bug with the crash reporter window and Dark Mode.

DropDMG 3.5.8 works with macOS 10.7 through 10.15. Older versions are available for older operating systems. For information about previous releases of DropDMG, please see the version history.

If you enjoy using DropDMG, please take a moment to review it on the Mac App Store, Product Hunt, or MacUpdate or to mention it on Twitter, Facebook, or your own site. We’d really appreciate it.

Update (2019-10-10): DropDMG 3.5.8 has been submitted to the Mac App Store and is awaiting approval from Apple.

Update (2019-10-11): DropDMG 3.5.8 is now available from the Mac App Store.