I bought Diarium on June 2020. I don't recall for which device I bought it. Here's the email below.
I have a new PC/phone now. I am trying to download the app for my PC but it's asking me to buy again.
I would like to know how to download the app for Windows 10 and also sync my data PC to Iphone.
Thank you for supporting indie app development!
If you already have Diarium installed from the Microsoft Store, you need to uninstall it first (make sure to make a database backup in the app settings) before installing it again using the .appinstaller file.