First the apk (Android) version can't work on windows and that's normal.
Second : How to convert the the download into an a game playable.
First your Dell computer need to be on Windows after
- download the compressed files.
- UNZIP the compressed fils and extrat all the files in just one folder. (You can use Windows unzip)
-After that open your folder and double click on the exe files named : Tower of the last Demon.
It's the same way to play all my other game. Hopes it's help.