When I try to open the downloaded file (ExpertSDR3 1.0.6 beta macOS.dmg ) in my environment (M1 mac, macOS 14.1.2), I get the message "Could not operate disk image due to error code 3840" I tried various commands with the xattr command, but the result was no good. As a last resort, I used the downloaded file on a virtual Windows 11 built on a mac and was able to open the file and install the program. So far, "E-Corder", "Radio Macro", "Radio Spot", "Radio Sync", "JTDX", "RumlogNG", which I often use, are working, so I decided to use V1.0.6 as it is.
I hope this will be of some help.　73 De JH3DRN

P.S. I downloaded it again on rome's advice and was able to install it without any problems. Sorry for the trouble.

Delete the file you have and download the one you'll find on Google Drive right now.

Rome-san Thanks for the good advice!