Google Translation: "I have version 5.7.1 installed. of Lightroom on my windows 10 computer, but I need to change my computer
to a new one and reinstall the program. I don't have the serial number or purchase email, but it's still
installed and working on my old computer. Can you help me to know how to get instructions to reinstall
this same version on my new computer?"
On the old computer- Find your Serial Number:
Download and run Belarc Advisor. Look for Software Licenses.
If you registered Lightroom with your Adobe Account-
Download v5.7.1 here- Lightroom 5 for Windows (957 MB)
Regards. My System: Lr-Classic 12.2 Photoshop 24.2, ACR 15.2, Lightroom 6.2, Lr-iOS 8.0.8, Bridge 13.0.2, Windows-11.