It is asking for .NET framework while installing

If you are using old Windows, it will ask you to install .NET framework first.
Just click yes and download it first. Then run Book Keeper Windows setup.

Microsoft .NET is required for Book Keeper Windows. Microsoft .NET is preinstalled in latest version of Windows, if it is not installed, you can download it from Microsoft website. Download link for .NET framework: https://www.microsoft.com/en-in/download/confirmation.aspx?id=42642

If it shows some error 2908 or HResult 0xc8000222 while installing .NET

Kindly check this video and follow the steps.
https://youtu.be/WejR1f09YMM

Video tutorial for how to install Book Keeper Windows: https://www.youtube.com/watch?v=aCPjnGo7c9s