If you are interested in upgrading to the latest version with a perpetual license you can download the latest version of LR 5.6 at the link below. Mac or Windows version. You can run as a trial version for 30 days and then purchase an upgrade license for $79. You then activate the trial with the upgrade key and when prompted you can input the LR 2 original license key to complete the process.
If you still have your LR 2 Catalog file the LR 5 version will create an upgrade copy for use there.
Info on transferring to a new computer is available.
If you don't want to upgrade for some reason, you can download the program and use your serial number.
Scroll the page until you find the latest or last version of Lightroom 2 and download it. You don't need to download and install each incremental number.
Lightroom has come a long way since version 2. You would be wise to consider upgrading to Lightroom 5. But the choice is yours, of course
Thank you so much! I was able to download it & enter my serial number! Now how do I upgrade to the latest Lightroom 5? How much will it cost?
The info you need is in my post above.