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I am new for XPP and want to learn. Can we get trial version of SDL XPP so that i can install in my machine.
I'm with development (and not support or sales), so I don't know for sure - but I would start by contacting your salesperson (or someone in sales) or opening a ticket (case) with support (at https://gateway.sdl.com - Login/Register at top right and then Log a Case).
BTW, if you didn't know already all the XPP documentation is available at https://docs.sdl.com (scroll down till you see the links for XPP).