How can I get itch.io app scan to recognize the game I downloaded from the itch.io web page?

[ZuoHuaiBuLuan]

I couldn't log in to the client itch.io for a while, so I downloaded a few games from itch.io website. The recently itch.io client can log in normally, but how can I get the client to recognize the game I downloaded from itch.io website? Or is there no way but to re-download it from the client? Looking forward to someone answering my questions! Thank you so much! Please forgive me for my bad English, which I translated with Bing.