Just
download and install v1.8 from this link and then activate with your existing key. If the activation is still current on your old computer, you should free it up by opening the "About ReefMaster" window and clicking the "Deactivate License" button. If you can't access that PC and all of your activations are already tied up then drop a mail to
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and we can fix it. If you want to try v2, you can download and install alongside your v1 installation.