Installing fonts in microsoft office on windows office is very simple process, follow below mentioned steps.
Download required front from internet.
You can download font from any of the following location ( Please check copyrights on below sites, these are shared for reference only. I am not aware of copyright and user licensing at below locations,).
got to Control Panel –> Appearance and Personalization –> Fonts
or simple type fonts in Cortana search box and it will take you to required folder.
To install newly downloaded font, simple drag *.ttf file and it will install the required font.
Using newly installed fonts
Reopen Microsoft Word and select font type as newly installed font as below.
After selecting font start typing using English keyboard and word will automatically convert it into required Marathi text.
Please let me know if you run into any issues while following above steps