Microsoft is now providing methods to roll back or selectively disable intel's incompetent attempt at fixing Spectre-induced problems. Since those "fixes" lead to system instabilities including random BSoD events and the associated loss of work and data while not preventing any known attacks, it's probably better to check into it:
https://support.microsoft.com/en-us...-disable-mitigation-against-spectre-variant-2
You can get updates for Windows 10 all the way down to 7 and associated server variants.
https://support.microsoft.com/en-us...-disable-mitigation-against-spectre-variant-2
You can get updates for Windows 10 all the way down to 7 and associated server variants.