MPC X & MPC Live Forum: Support and discussion for the MPC X & MPC Live, Akai's current generation of standalone MPCs.
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By MPC-Tutor Fri Sep 20, 2019 2:30 pm
Full instructions are included in the PDF bundled with the expansion, and here ... -Guide.pdf.

Please install the XPN exactly as described in the PDF, i.e. drag the XPN file into the MPC grid, and it will install and work perfectly.

Do not drag the xpn to the icon in your dock, and do not double-click the XPN or try to load from the browser, because this is how you get the 'mpc project failed to load' message (which is a bug that Akai haven't fixed yet)