Recently updated my desktop to a new Windows 11 machine. When I try yo install CADHobby using installation disc, I get a message that says "There was a problem starting C:\\Windows\Installer\MSI74D9.tmp. C:\Windows\Installer\MSI74D9.tmp is not a valid Win32 application. I'm completely puzzled what to do next. Had no issues installing it on my old Win10 machine.
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Make sure to install all Windows pending updates and reboot at the end. Also check the installer file provided at the USB flash drive.