Your premise is wrong ... re-installing does not change or delete the existing catalog.
Furthermore, you can just enter your serial number into the trial version, Help->Lightroom Registration, and its not a trial any more ... very simple.
Your premise is wrong ... re-installing does not change or delete the existing catalog.
Furthermore, you can just enter your serial number into the trial version, Help->Lightroom Registration, and its not a trial any more ... very simple.