MIM and BHOLD Upgrade

Question?

I see the documentation for upgrading FIM 2010 R2 to MIM and have completed that in my test environment.  But, there is no mention of BHOLD.  The BHOLD installation options are on the ISO. But, it this truly and upgrade, or does the old BHOLD have to be uninstalled and then the new BHOLD installed?

And, is there someplace that lists the BHOLD build numbers?  I'm at 5.0.3079 right now.

Thanks,

Greg