Disk images couldn't be opened when downloading .dmg file

Since I upgraded to Yosemite I haven't been able to instal a .dmg file for upgrade of adobe - assumed a corrupt file but it wasn't vital so I ignored it until today when I needed to use the player.
I have run disk verification/permission checks - all ok & I have turned off security & firewalls but, even with deleting and redownloading the files several times after purging the error code still says
'The following disk images couldn't be opened' = reason given 'No such file or directory'
I have also tried to download Opera and Chrome today - the same error occurs.
Running Yosemite on Macbook pro from 2013 - all softwares up to date and problem recent - can anyone help?
Simon

Same problem here. Restarting Mac fixes it for awhile, but then I start getting the "No such file" error again.

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