Would there be any downside to going through this modded version for a first playthrough or is it better to go through the
Kagura Games v1.03 or mod ver1.062 first instead? Haven't touched this game at all yet.
The Kagura Games translation and this mod translation are different.
This mod used the fan-made translation, which is really good, made long ago.
(The mod ver1.062 also uses the fan-made one, it was made by Borkenone and it is basically incorporated in this mod)
If you want to enjoy the vanilla experience, in a first playthrough, I would go for Kagura one.
But if you enjoy impregnation and or pregnancy content, I would just go for this mod.
Also, if you play the vanilla game, and enjoy the two fetishes mentioned above, you'll understand why this mod were made to begin with...