This isn't a step by step guide on how to install IMC. I've addressed problems I've encountered whilst installing, and how to overcome them.
Windows Server 2012 - Installing IMC - Unable to install windows .net 3.5 feature set - The source files could not be found.
Mount the ISO into the D: drive and run the following in an elevated administrator cmd prompt - if you're using a different drive letter, amend the line below appropriately.
Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess