Normally e-on updates the plugins to the latest version of the host app. How long does it take to update it?  No precise answer to this.
Vue7 will work with Max 2010 if you update it to the latest 7.4 build.
E-on doesn't update earlier versions to the latest version of Max. Vue 6 xSt won't work in Max 2010 for example. Once a new version of Vue is out, prior versions are not updated.
If you get Vue8, chances are it will work with Max 2009 and 2010, even earlier. Current Vue7.4 works from Max 9 to 2010, maybe earlier, I'm not sure.