INSTALLATION: After you have made your purchase you will be able to download the zip files containing the brushes you have paid for. If you are on a Windows computer you should download the zip files, unzip them, and upload them to your Dropbox or icloud, from there you can drag them easily into Procreate using the Files app on your iPad. If you are using a Mac, you can download them, unzip them and then Select and Share them directly to your iPad using Airdrop, this is by far the quickest method. If you only have access to an iPad then you will need to use whichever zip file opening App you prefer and then from there drag them across into Procreate using the Files app.