DB client tool -- To get the error message when open toad oracle client

I have a serious problem with toad oracle client. I got the error message as following when I open toad client (installed and then opened it): > Error: No valid Oracle clients found. You need at least one 64-bit > client properly configured Please do me a favor to give me how to deal with this issue or give me any slim clue. Download from toad official website with 64-bit like as following picture