The IntelliPrint app for Windows requires a minimum of Windows 7, with Microsoft .NET Framework 4.5 or above.
The IntelliPrint app for Windows uses SumatraPDF which is released under the (A)GPLv3 license, the source code for which can be found here.
Once you have downloaded the installer executable, open it. You will need the appropriate privileges to install software onto your computer. Follow the installer prompts to install the app. Once complete, open the app.
You will be presented with a dialog prompting you to enter your Shopify store's details. Your myshopify domain is the domain given to your store by Shopify. It is the domain you see in your address bar when visiting your store's administration panel, ending with .myshopify.com. Enter your myshopify domain without the leading "https://" and ending at the .com. e.g. intelliprint.myshopify.com
Your App Key is a randomly generated key that you can find by clicking the Store Preferences option on the Settings page of the IntelliPrint dashboard. You will need to enter it exactly as it is shown in the IntelliPrint dashboard.
After you have entered your store's details, click the Save button. If the details you entered were correct, the setup is now complete!