Right after checkout you'll get an email from our store (Lemon Squeezy) containing your download link, your license key (looks like XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX) and your receipt. The success page shows the same download button and key.
In the app: 🔑 License → Deactivate this PC. Then activate on the new PC with the same key. If your old PC broke and you can't deactivate, just contact support with your order email — we'll free the license for you.
Notes live in the data folder next to InkyPages.exe. Back that folder up any time, or use Export (⬆ in the app) to save your whole book as one file. A license problem never blocks reading or exporting your notes.