First of all, Thank you for supporting a creative small business.
As the purchaser of this artwork/pattern, you are allowed to make use of the digital item, printable PDF, to create unlimited prints for your own personal use.
You are allowed to send it to a third-party printing service to create a printout that is for your own personal use. You are not allowed to make prints of the digital item to sell to others.
You cannot sell, distribute, alter, modify the original file, or parts of it.