I have lightroom on Mac-computer1 wanting to use on Mac-computer2. I have downloaded a trial version and tried to register online with existing serial# why is this happening??
You just need to enter the serial number in the trial dialog that opens when you start it on the 2nd machine. You shouldn't need to register again.
thanks Sean, tried again but it reverts me to login to Adobe message 'invalid' when I enter serial #. Just wondering if it because its the version not connected to CC & maybe the trial version is??
You probably downloaded the CC trial version. Uninstall then download the appropriate update version available from the site below. And install. Your serial number should be accepted.