How do I remap page down to (Ctrl+Win+left) for Windows 10 desktop switch.
Same for page up to Ctrl+Win+right
In AutoHotkey if you want to press the Page Up/Down keys and have it send the key combinations listed, your script should look something like this:
PgDn::Send ^#{Left} ; ^ = Control and # = Windows Key
PgUp::Send ^#{Right}
This person had the same issue that you were looking to resolve. Microsoft has a solution that allows you to use multiple keys.
http://www.microsoft.com/en-us/download/details.aspx?id=22339