I cannot find Karma renderer where is it should be, there is no even such node as Karma in Out context. What could be wrong? Is it a bug? How can I fix it? Reinstallation doesn't help

There is no Karma node in the out context. The out context node is called 'usdrender' and it renders usd files or lop networks with the selected renderer which can be karma.

There is also the "karma" node in the Lighting (LOP) context. This node combines several nodes such as render settings with the usd render node to make rendering with Karma streamlined.

Thanks! My knowledge of Houdini lift up a bit