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This installation guide is written for Windows 10. You can use the same installer for Windows 8 and 7, but what you see will differ from the screenshots below.
First download the Rohingya-Keyboard-Layout.zip file containing the Rohingya keyboard layout for Rohingya. Then open Explorer and go to your downloads folder to find the Rohingya-Keyboard-Layout.zip file.
There are two ways to extract the zip archive. You can either 1) click the ‘Extract’-tab (shown in red) at the top of Explorer when zip archive is selected, and then press the ‘Extract all’ button, or 2) right-click the zip file and choose ‘Extract All…’ from the context menu.
Click ‘Extract’-tab and then ‘Extract all’ buttoon 
Right-click zip-file and choose ‘Extract All…’ from context menu.
This will open an ‘Extract Compressed (Zipped) Folders’ dialog. Unless you know what you’re doing, just keep the default location and click ‘Extract’.
When the archive is extracted, a new Explorer will open showing the contents of the extracted folder. Double-click the ‘setup.exe’ file to start installation.
When the installation starts, you will need to give the installer permissions to install the Rohingya keyboard layout.
When installation is done, you will see the dialog below.
If the keyboard layout you had before installing the Rohingya keyboard was English, you will now see an ‘ENG’ on the right side of your taskbar. Click on ‘ENG’ and select the Rohingya keyboard.
You are now ready to start typing Rohingya on your Windows computer.