Been struggling to install Oculus on a larger SSD drive using Win7, and after jumping through hoops for ~4 months over the "missing KBs", the Oculus installer finally admitted (paraphrased), "requires Windows 10".
They've recently (within the last month) included Win10 in their published minimum requirements for the Rift.
I hope the rest of you still have it working on Win7 but those days are numbered.