Hello Marne
Mach4 version 2 is fully supported by our motion controllers. This list includes 7866, 7766, EC01, DSPMCv3, & HiCON mini.
When you update Mach4 Please update the firmware on the controller, The plugin in Mach4 and VSI Device manager to the latest version. The manuals and downloads are available near the bottom of each product page on our website.
We also encourage our users to maintain backups in case they don't like something that was added in by Mach4 or us and if there are some breaking changes for your custom scripts. Usually there is no need to update to the latest version if you are happy with the current operation. We continually add new features and bug fixes. It is nice to hear you had backups.