For me the September update worked perfectly...
Two different Lenovo Thinkpads with Core i5 CPUs, both Win7-64, HDDs in MBR mode (no GPT partitions), BIOS in Legacy mode, no UEFI or Secure Boot). One of them even with Rollback RX installed (not disabled during the update).
After the trouble with the SHA2 signatures in the August update I did expect trouble, but I was pleasantly surprised.