[gtirloni]

find /path -user <username/UID>

https://man7.org/linux/man-pages/man1/find.1.html

[dogol]

$ find 'https://sourceforge.net/projects/elkirtasse/files/' -user $USER

find: 'https://sourceforge.net/projects/elkirtasse/files/': No such file or directory

How, what is the real correct answer

[ElCapitanMarkla]

find works on your local drives not internet addresses. You’d have to download that project to use find on it.