Change the trackpad of Acer C720

Hello,

I have an Acer C720 which was at Acer.com for repair. They sad that they have had to change the trackpad and keyboard. Before the repair the trackpad was controlled by a chip of Cypress APA I2C Trackpad, now it is by some ElanTech chip which is unsupported by the Operatings system I'm running on the C720.

How can I replace this again?

Thanks