CasparCG is compatible with all KRONOS and Epoch Bluefish444 video I/O cards.
The current Bluefish Windows Installer 2020.14 is available to download here, and is compatible with CasparCG 2.2.0 and 2.3.x which can be downloaded from the CasparCG website.
Bluefish Windows Installer v5.13.6 can be used with Epoch video cards for compatibility with CasparCG 2.1.0 (note that KRONOS does not have support for versions of CasparCG prior to 2.2.0).