Based on the software version name you provided, refers to a specific legacy build of the graphic design software used with Silhouette cutting machines (Cameo, Portrait, Curio).
However, note that the "Cloud Services" (like the Design Store) may eventually deprecate older versions. As of 2025, 4.5.807 still connects to the Silhouette store to download purchased designs, but this may change in the future. Silhouette Studio Business Edition 4.5.807