Reviviste un thread que no tenía actividad desde hace más de un mes... y por cierto, seguro que este era el thread correcto? O incluso el foro correcto...? Casi nadie habla español por aquí...
To avoid Windows 10 security updates, you'd have to disconnect the system from the Internet, permanently. Windows 10 updates are cumulative and all in one, meaning you get security patches, bug-fixing patches and everything else in only one update, and everything gets installed.
Windows 7 allows you to do that, flagging updates so that they don't get installed. Windows 10 Home just installs everything, the Pro version allows you to choose the Business Branch (now they call it the Semi-Annual Channel), which avoids getting the big feature upgrades (for example, from the Creators Update to the Fall Creators Update), for at least 4 months. Also, the Pro edition can pause updates for up to 35 days.
However, being that the Meltdown/Spectre patch is considered a security update, even if it is also a microcode update, it may be impossible to avoid it without stopping all other updates.