Original Title: ママクラブ四 ~正しい性教育を教えよう~
Romaji: Mama Club Shi ~Tadashii Seikyouiku o Oshieyou~
Release Date: 2018/04/27
Company/Producer: Complet's
Getchu Link: http://www.getchu.com/soft.phtml?id=992296
VNDB Link: https://vndb.org/v22479
I know it's been a while since a Complet's game was decent...
You linked the mega without the decryption key. You need to link with key for others to be able to download, or it will ask for the key. It's an automatic thing with Mega, not something you can activate/deactivate.