Do you need both. To add one more point. All Frameworks prior to 4. CLR yes, even 3. CLR. Microsoft has made every attempt to make 4. CLR a seamless in place upgrade or service if not feature pack. Like another astute commented stated above, if you have dependencies for 3. Does anyone know if the Entity and LINQ stacks have been fully transitioned from the 3. Framework Im assuming that it has, but not sure. Another note. Simply installing 4. MOSS2. K7, SP2. 01. If, like me, you are constantly wanting to just extract the files from a Windows Installer MSI file quickly, then this is for you. My ZIP utility of choice 7Zip. Dot Net 4 Msi Installer' title='Dot Net 4 Msi Installer' />The upgrade to Win 10 disabled Dot Net. Ive seen this happen to my clients. Pre Ban Colt Ar 15 Serial Numbers. Since Dot Net is included in the Win 10 OS, it does not show up as an installed.