Hi, if you open go to utilities and open activity monitor you can then search the items, double click on Safari Notifications, this will cause a pop-up window to come-up. Click force quite to turn off Safari Notifications. You can now download Apps from Adobe.
Hope this helps.
I also found two lines of code that will turn on and off notifications. If you do not want screen notification to run go to Utilities > Terminal> and input code:
launchctl unload -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
To turn on again code:
launchctl load -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
Cannot take the credit for the code etc. Found it by searching.