Are you referring to this Order Printer app by Shopify?
If so, I've just tried adding the app to my store and was able to do so successfully. To rule out any browser caching issues on your end, you can follow the troubleshooting steps below to see if it'll allow you to successfully add the app to your store:
Let me know how you get on with this!
I tried all those different options, but still can't get the app to install. I'm not sure what the issue is, but every time I get a message that says 'There's no page at this address."
Thanks for the update, @Roguesteel.
Seeing as you're still experiencing the error on your end, your next best step is to reach out to our Live Support team. We'll be able to take a closer look at your account to further troubleshoot the situation.
To get in touch with our team, you'll need to login to your store via our help centre here. Once logged in, select a topic that best fits your query or situation. From there, you'll be taken to a page with a list of relevant support articles, and you can scroll to the bottom of that page to select your preferred contact method with our team.
You can try app Order Printer Pro: Invoice App - Auto-deliver customer invoices and receipts. Fast order printer for packing slips, returns & more (836 reviews - rating 4.9)
I recommend giving the OrderlyPrint app a try. This app order printer solution features pick lists, packing slips, invoices, returns forms, and address labels.
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