Installation files & backup

Hi!

How can I download the installation files and backup them on my drive? I have a great working version and I would like to keep installation files but it is only available through microsoft store.

Windows Store installation packages cannot be downloaded separately.

Thanks.
There is an offline way to download appx files and install from the store but its too complicated.
Is it possibile to make installation *.exe file? How do ppl download linux version?