Logic Pro X compatibility with High Sierra 10.13.6

1). Does anyone know why i cant download Logic Pro X fro OS High Sierra 10.13.6? I am trying to purchase Logic but it says i need OS 10.14.6. Can i download an older version of Logic to run on High Sierra?

2). Also, i have a Macbook pro that will not let me purchase Logic as well. I recently had it installed under a different apple id. I removed Logic from my macbook pro but it wont let me purchase, it only allows me to update. But i dont have the password to the old apple id.