Hi,
OctaneRender v4 does not have the support for RTX 30X0 Ampere GPUs, since it is based on a very old CUDA version.
To have the RTX 30X0 support, you need to install 2020.2, to work with CUDA 11.2.
V4 was based on CUDA 10, and cannot be rewritten from scratch to work with recent CUDA versions.
So, the only solution is to upgrade your v4 licenses to 2020, to be able to use new 2020.2 versions, or greater.
Your commercial v4 licenses are perpetual, and will be always yours.
Now you have some possibility to update your licenses to v2020.
If you want to use new versions, you can purchase an annual Enterprise subscription update for 199€, but at the end of the annual maintenance, your licenses will go back to v4:
https://render.otoy.com/shop/upgrade.ph ... C67-UGAA1Y.
if you want to upgrade also your v4 perpetual licenses to perpetual v2020, the upgrading path is more expensive, 499€:
https://render.otoy.com/shop/upgrade.phpPlease note that all new subscriptions offer you the possibility to use any type of Octane DCC plug-in, including C4D or Maya, or OctaneX, and ORC/RNDR subscriptions, (render credits need to be purchased separately).
Happy GPU rendering,
ciao Beppe