Apologies I was not more clear! The new license key should work perfectly well with the version of Link presently installed regardless of version and whether it was purchased as part of the Pro Pack or not. This is why I asked which key you were using when attempting to activate Link. If you can let me know, that would be great. I can look into the activation logs.
To answer your question, yes, you can delete the version of Link you have installed and install the version you just downloaded as part of your new purchase as there is no difference between the two except for the new features and bug fixes in the newer version. Put another way, yes, you current links will be maintained.
Hope this answers your question without further confusion. Let me know.