Winclone Standard shows "Invalid Key" during activation on Second Mac

I purchased Winclone Standard about 2 days ago. I own three Macs but use same Apple ID on All. I installed Winclone on my Mac mini which worked ok. Today trying to install on iMac but it is giving “Invalid Key” error.
Is there a limitation in Winclone Standard to install on only 1 Mac??

Winclone standard comes with a license for 2 machines and is limited to 2 activations. If you require assistance when moving it to a new machine, you can submit a request here:


Thank you for the clarification Tim.