TouchDesigner DMG Fails to Mount on macOS 26.0.1 (Tahoe) / M4 Max

by3mar · October 29, 2025, 12:27pm

Hey Derivative Team,

I’m unable to install TouchDesigner on my new MacBook Pro (16-inch, 2024, M4 Max 48 GB) running macOS Tahoe 26.0.1.

DMGs tested:

Error:

“The disk image couldn’t be opened. There are no mountable file systems in the disk image.”

Tried:

Re-downloaded via Safari & Chrome
Mounting manually via Terminal (hdiutil attach -noverify -ignorebadchecksums)
Extraction with The Unarchiver (fails: ‘cannot be extracted’)
Verified DMG mounts fine on macOS 14 (Sonoma)
→ So the issue is clearly the DMG format/signature vs macOS Tahoe’s new image system.

Could you please confirm if a macOS 26/Tahoe-signed Universal or ZIP build is available or in testing?
Happy to help test if needed!

Thanks!
Omar (M4 Max / macOS Tahoe 26.0.1)

malcolm · October 29, 2025, 8:29pm

Hey, I’m unable to reproduce this issue. The old .dmg images should still be openable. Not every image needs to use the new format I would assume.

Is your main drive using the new file system?