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Because there is no central "Laser Cut 51" website, you must acquire the software directly from your laser supplier. Here are the three safest methods:
If you insist on using the original software (perhaps because you need the Raster mode or specific driver features), follow this safety protocol: laser cut 51 download link
Assuming you found a legitimate Setup.exe: Because there is no central "Laser Cut 51"
If you lost the USB drive, message the seller on eBay, Amazon, AliExpress, or wherever you bought the machine. Ask for: "The software driver CD or USB files for
"The software driver CD or USB files for the Leetro controller. I need Laser Cut 5.3 for Windows." Reputable sellers will send you a Google Drive or Dropbox link directly. This is the second safest method.
Buy a modern controller (Ruida RDC6445 or Trocen AWC). This costs $300–$500 but allows you to use LightBurn, which is vastly superior (easier design, Wi-Fi transfer, camera alignment). You will never need Laser Cut 5.1 again.
Searching for "LaserCut 51 download" on random file-sharing sites or forums often leads to files infected with malware or viruses.