Google API OAuth can't login, how to check?

Question

Google

Downloaded the application of one person (does not get in touch). It worked successfully on WinXP, but does not work on Win7 + in terms of authorization in the Google API. The description is here . An application has been created, it has been granted rights as in the instructions. An access key for the native app has been created, the data has been entered into the program. When I try to connect, a login window pops up. I click "allow" pops up again. I don't understand this myself, so I'm asking for help.
Since it worked under XP, it was therefore not a matter of the program, but either of the rights, or of the Google api. I would start by checking ID and Secret. But I don't know how.
Grateful for any help!

Answer 1

I found the reason - the whole thing was in the not installed OpenSSL in Windows.