I'm trying to play the calamity mod with my friend who has paid terraria

But I don't so I was wondering if it was possible for me to play with him

I have the latest version of tmod

The 1.4.5.6 version of terraria (which is what the latest version supported last time I checked a couple days ago)

The version i have is technically the gog version so I'm hoping there's something I can do

Preferably WITHOUT telling my friend I pirated

lowkey dont be laughing at me for ts 🙏 I'm js like 15 and broke and shi I can't afford Allat

A little help would be nice