After I saw the update to my current tool of choice WUMT, I checked it out.
Today I checked for updates and one Microsoft defender update was identified. See 
This claims the update is 1.55Gb in size.
So I tried in Windows Update Manager. See 
which gave the size as 1.55GB
Then I checked with the 2020 version of WUMT. See 
This told me the size was 282.42Kb.
I believe that the WUMPT 2020 size is most likely to be correct but what is going on with the other two utilities. 1.55 Gigabits? 1.55 Gigabytes?
Dell Inspiron 16 Plus 7640 Core Ultra 7 155H 32GB Win 11 Pro 23H2 (22631.5335)
Dell Inspiron 15 7580 i7 16GB Win 11 pro 24H2 (26100.4061),
Microsoft 365 Version 2504 (18730.20122)
Location: UK
