Windows installation in the Program Files folder : 315 Mo
There is also another folder in AppData > Local > Meltytech > Shotcut that weights only a few megs after installation but it can grow over time if you use proxies and don’t delete them.
EDIT: hmm Actually, there is a large file in AppData > Local > Meltytech > Shotcut db.sqlite3 = 186 Mo
Related to the creation of proxies in hidden folder, I configured Shotcut so that the creation of proxies has another destination, as I explain in these links, to be able to manage better the proxies that I don’t need.