How to install side by side SS2 and SS4?

Good afternoon,

I'd like some advice and/or instructions on how to install SS4, but keeping SS2 intact, please?

We have ongoing jobs with our local DOT that require us to maintain SS2, but now with a couple new jobs beginning we are also required to use SS4.

I've read in other posts to use the "easymultiinstall.vbs", this however doesn't seem to exist for SS4 or I'm at a loss where it is.

Please offer any help.