I only have my box for my Adobe Photoshop Lightroom 5. How can I re-install this after a system crash, having lost my serial number card?
You can login to Adobe ID and retrieve your serial number.
You can use the below links to download Lightroom 5.
You need to install Lightroom 5.2 on your computer.
Once done, make sure you activate the product before upgrading it to latest version of Lightroom.