Make sure that your internet connection is working
If everything appears correct, you might try signing out and then back in again.Check that the Enable Messages box is checked and that the listed Apple ID is correct.Open preferences, and select the iMessage tab.Click on the Messages menu, found on the top left of the screen next to the Apple logo.It’s possible that there is no error with iMessage, but simply that you have not configured it to receive messages on your Mac. Once macOS has booted up again, open the iMessage app and attempt to send another message.Click Restart to carry out the reboot process.Click on the Apple menu, featuring the Apple logo, that can be found in the top left of the Mac display.That could be enough to get iMessage to work on Mac again.
#How to make a pic on imessage download software
A restart will wipe away current software states, including any tricky misbehaving code. Restarting your Mac may be enough to clean out the cobwebs and get iMessage working again. Your first port of call if you find iMessages are not delivering on Mac is also the simplest. Making sure it’s not a problem with Apple.