Thanks for answering for me?
It's not something we can fix because it's not something we can control. Adobe won't do it obviously, and OSX is just moving forward and removing old things causing older things to stop working. Another version of MyVMK Experience might be possible, but I don't know (that worked using something called WINE). The new client will work on any operating system with a decently modern web browser though, but we can't release that until it's done obviously. For now, you might want to consider using a virtual machine, which will always work.