Currently, the C-nano client in github releases uses krpc_cnano folder for headers but the one in Arduino Library Manager doesn't. This causes problems for other services which depend on kRPC because the generated code has #include statements pointing to this folder, as reported in Genhis/KRPC.MechJeb#11 (comment).

Can the names be unified? Is the original reporter doing something incorrectly?

Working on this. I'll keep the client on github releases as krpc_cnano and update the Arduino library to use the same.