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If you go to the inner sanctum you will see a button labeled modding which will take you to a guide on how to mod LD Classic

do I really have to buy rpg maker?

Isn't there another way?

No other way that I know, unless you want to spend the time looking for it on various torrenting sites

You don't need to buy RPG Maker to play RPG Maker games, or install mods for them.

Lust Doll+ is free with an option to support it's Dev.

If you want to install a mod, you shouldn't need RPG Maker, unless you're installing conflicting mods.

But if you want to create a mod, then yes, you do need a copy of the RPG Maker used to create the game, and the game's project files.

Bringing this up since OP didn't clarify if they were installing or creating a mod.