Hi,
we have updated the Downloads section with v4.05-R5, v2018.1.3-R3 (v5):
https://render.otoy.com/account/download_archive.phpYou need to select your purchased license version from the Select Software pop up:
And you can find v2019.1-R2 (v6) in the Maxon Release section:
viewtopic.php?f=85&t=72696All three versions are compatible with R21.
Note that you always need to remove from the c4doctane folder, all the unnecessary c4doctane-RXX.cdl64/xdl64 files not related with R21 specific version, and leave only the c4doctane_R21.xdl file in ../c4doctane directory.
Happy GPU Rendering,
ciao Beppe