Does anyone know a good tip or site for downloading Japanese software?
Literal
Japanese [genitive-の] software [object-を] drop tip, good site exist-not [polite-ませんか]?
落とす ('to drop') here is used colloquially for 'to download' — a direct metaphor parallel to English 'to download' (though less common now; ダウンロードする is the standard). コツ ('knack, tip, trick') is a casual word for 'how-to secret.' ~ありませんか? ('isn't there...?') is a soft negative-question form used to ask for information tentatively.