First of all you need to connect to a good internet connection. Got to the website click here and you need to search microsoft ofiice pro plus 2019 and click on that link then you will be redirected into the interface shown below.



Click on the button  DOWNLOAD FULL SETUP  which is 9.8GB and the download will be started.
After downloading the file, you need to enter the password to open the file i.e, 123 and use win rar application to extract the zipped file and open disc type file in that and install office setup apk file.
And thats'it you are done. You can use your ms office.
Additional tip: 
If the site server is slow when you are downloading the file, you can contact me via mail I will send the G drive link which is fast.
You can find the win rar apk file for desktop in google.

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