I failed to install sync on Lenovo Yoga 2 Pro that has a quad HD display (3200x1800). The first dialog box shown during the installation has a fixed size defined in pixels, it seems, and only part of the text fits in it. More fatally, the check box that would allow me to accept the Privacy policy and Terms of service remains outside the dialog area. I tried to switch display settings and switched to an external screen. Didn't solve the problem. So it seems that it is at present impossible to use sync if you also have machines with HiDPI displays. Probably the same case for Mac Retina machines.
