Nav 2013 R2 multiple build installation on same windows

Hi all

I'm actually confronted to a problem who's basically technical, not only on Nav side but on windows side too.

I need to install on the same computer who's working on Windows 2012 Server two installations of Nav who've to run together. This include dev env, NST and RoleTailored Client.

Sadly these versions have some different entries needed on the windows registry visibly, so:

- I cannot install them in parallel because these 2 versions seen themselves as being similar, if I try to install the second I can only add or remove components of the previous installed.
- I cannot only copy clients folder (or only one of them) because these 2 versions are needed registry entries (and visibly some other things like dll registrations..). On run, the 'only copied' RTC crash.

These versions are both 2013 R2 but build's are 37211 and 38455

Anyone have an idea how I can resolve that? :-k

I'm blocked and I don't have any other solution that install these two versions on this same windows server.

Thx 8)