It still might...
If order is not important, put the launcher at the end, where it doesn't matter.
If order is important, then you may be able to introduce a delay for long enough to complete the previous install.
Will these be interactive installs (i.e. Select install directory, click Next, etc.) or do they just do their thing with predetermined settings or options (not uncommon in an office environment)?
BTW, what the heck is Heatware? I see lots of posts with links to it, but why?