jerryc41 wrote:
One doesn't over-write the other. That seems to apply to all Adobe products. I've had two versions of several programs on at once, just as a fall-back.
In most cases, it helps to have the older version installed when you install the new one. LR5 saw that LR4 was on my computer, and it found the serial number. I had to enter the SN for LR5, and the installation continued, after upgrading the catalog.
Exactly the same happened with my install. No problems it took less than 15 minutes to have upgrade downloaded and installed. Amazingly fast display of picture previews.