Does anyone know why my Macbook tells me that

[Isabella]

there is an update available 

And when I hit "update now"

 

It only turns off and turns on as if it is restarting

 

and then the screen shows that it is checking for updates

and tells me again the same thing as before 

As it has happened, I can do it many times with the same result  

[Isabella]

Super @admin

[admin]

It shouldn't start the entire process unless it sees enough space first.

Not yet sure what it is.

[Isabella]

Entendido, gracias

[mkrsnow28]

Mine shows there's an update however its already up to date. Looks like you have automatic updates on already,  wouldn't worry too much about it.

[admin]

Q: Why does the macOS Catalina 10.15.4 update not install correctly?

A: You are out of disk space

• Clear out old, unneeded, unnecessary files until you clear out 20% free space then delete the trash
• Boot into macOS Recovery Mode
  • Run Disk Utility to check the drive
  • Repeat running Disk Utility until it reports no repairs were made
• Reboot normally
• Update
• Done