Thank for the replies, sorry i failed to mentioned that this SW package is not from Adobe but another company. I am using BitDefender as AV software.
I removed the previous versions of the program with an uninstall option supplied by the same company before a reboot and re-install. Everything seems to go fine until I try to enter the activation key which is when the error message occurs that the activation is not possible. No reason is given.
The company have replied that that some antivirus applications have been blocking the download and activation of the application. This is considered a false positive, meaning it’s falsely reporting that th application may be harmful. Now as far as i can tell the download and installation are successful. I get no warnings or error message from windows or my AV software to recognize a threat so this part has puzzled me.