How do I stop the 6.1 update from installing

[letitgo9]

How do I stop an 6.1 installation that I'd to happen tomorrow 

[PrivacyandSecurity]

A screen with wait to install should come up after the download.

[letitgo9]

Then what do I do ?

[meself]

You will get notice that a update is available as for stopping any not sure that can happen or if you want yo skip one for example