One of the things I like the most about Macs is that their system, macOS is a system that is always subject to periodic updates by Apple, which can be put to sea whenever we want and that we will leave a morning without working because he himself decides to update himself as has happened to me with some other system that is better not to talk about.
The fact is that this way of operating macOS in which we have the possibility of scheduling our updates or simply not doing them until we see fit, may have an aspect against And it is that we will have in the notification center days yes and days also a reminder so that the system is updated.
However, as we have already explained in more than one article, the Mac system can be configured beyond what the graphical interface allows, so we can force the system not to drive us crazy with so much notification so that update to MacOS High Sierra 10.13. But now you may wonder ... Why don't you want to upgrade to the new system? There are many answers to that question, and in my case I have some Macs in which I want to continue keeping a certain version of their operating system, others in which I have applications that They do not support new versions and in which I write that if I am interested in being up-to-date in software.

As you can see, I myself have several cases in which I may or may not want to update my Mac's system and therefore, there are times that the simple fact that the reminder that I must update is continually coming up bothers me.
If you want to deactivate this mode of operation, you can do so by deleting a simple file, but be careful that once deleted the system will never ask. In order to disable the system reminding you that you have to update to macOS High Sierra 10.13:
- Finder> Go> Go to Folder> / Library / Bundles /
- We delete the file: OSXNotification.bundle