This driver (or part of it) is not digitally signed, hence during silent install in SCCM TS Windows 7 x64 it will "hang" waiting to accept the unsigned driver (NOT during Apply drivers, but Sequence that runs setup.exe - I install ALL graphics drivers this way!)
Had top revert to previous version
Intel HD, 5300, 5500, 6000, 515, 520, 530, P530, Iris 540 Graphics Driver, 22.214.171.12490, A05
to be able to do silent install!
Somebody else might have noticed?
All Dell released drivers should have a valid digital signature. Not sure why that A09 is showing as unsigned in the install. Until Dell posts another driver, all you can do is what you did, go back to an older signed driver.
Well, one would expect that they are, which is NOT the case in 126.96.36.19931, A09
So yes, revert is the only option!