You don't have to. That's the whole point of modern.ie, Microsoft released these absolutely for free to spur testing in multiple OS environments.

MT4 stopped running on Mac OS X Yosemite

Have you thought about running it in VirtualBox using a VM from url (They come with 90 day expiration periods, but once you boot up for the first time, the desktop will have instructions on rearming the VM for continued use as long as you need ...

MT4 stopped running on Mac OS X Yosemite

@fxx Trader I fixed the files for you. Attach and try to compile, you should get no more warnings.

I will code your EAs and Indicators for no charge