I get an error message that says:
Warning. The following disk images couldn't be opened.
Image Reason SurveillanceClient.dmg invalid checksum
Does anyone have ideas on how to install this file?
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In this YouTube video, they teach you how to fix this. Anyway, after El Capitan, Disk Utility has been completely changed, so now, in order to disable the checksum verification, you can just open a Terminal window and type:
defaults write com.apple.frameworks.diskimages skip-verify -bool true
Then open again your .dmg. Now it should work.
I was getting this error in High Sierra and it had been bugging me for a while.
So I investigated the volumes I had mounted using Disk Utility and found that there were two uninitialized volumes remaining that I couldn't format, mount or erase.
What solved the problem for me, was clicking the Apple symbol in the upper-right hand corner and searching for 'Force Quit'. I relaunched Finder and logged out immediately, not re-opening any applications...
Then I logged back in after I had been logged out and clicked Finder > Applications > Utilities && finally I opened the 'Terminal' application.
MAKE SURE NO DISK IMAGES ARE MOUNTED OR OPEN
Once in Terminal, I typed the following:
sudo chmod 775 /Volumes
typed in my password, and mounted my disk image!