I need to use Cubase SX 3, which I own, on Mac OS X 10.6 Snow Leopard, to import old Cubase .SNG and .ARR files (as explained in this post from the Steinberg Support Team: https://www.steinberg.net/forums/viewtopic.php?f=146&t=230).
It was working fine until I upgraded to Cubase Pro 10.5 on my main computer (running High Sierra) and took the opportunity to buy a new USB key. Since then, I can’t open SX 3 on Snow Leo. I can’t even launch Cubase 6.5 on Snow Leo anymore, even if I can on High Sierra. All I’ve got is the dreaded message “No Valid License found”.
Indeed, only Cubase Pro 10.5 appears on my USB-eLicenser. No trace of Cubase SX3, 4, 5, 6 and 6.5 although I bought them all.