For folks on Windows looking for Meltdown/Spectre protection but whose motherboard manufacturers are no longer pushing updates, this appears to be an option. I posted this in the other thread[1] but thought it warranted some more exposure.
Here are links to the latest microcodes I could find for Intel[2] and AMD[3]. As additional fixes come out, it is trivial to copy the updated microcode file over and reboot.
[1] https://news.ycombinator.com/item?id=16085672
[2] https://downloadcenter.intel.com/download/27337/Linux-Proces...
[3] https://git.kernel.org/pub/scm/linux/kernel/git/firmware/lin...
YMMV, no warranty express or implied, etc.
