I was able to install the griddb-c-client on WSL, by downloading the griddb-c-client_5.7.0_amd64.deb file from https://github.com/griddb/c_client/releases/download/v5.7.0/griddb-c-client_5.7.0_amd64.deb and saving it in my home folder, typically located on C:\USERS<login>. In my case it’s 270274. Then, I ran the following command on a WSL to install the package:

griddbusr@REI023154:/mnt/c/Users/270274$ sudo dpkg -i griddb-c-client_5.7.0_amd64.deb