SB website seems to allude that there is, but I cannot seem to download it. When I follow the links it appears to default to Dorico 6.
Yes, Dorico SE is available. If you already have Dorico SE, simply download Dorico SE 6 from Steinberg Download Assistant, and run it: your existing Dorico SE license has already been updated to allow you to run Dorico 6.
The first 2 times I tried to download 6 SE it would not open and took me to the activation manager that did not recognize it either. On my 3rd try of downloading it it finally opened.