TWebUpdate Error Codes

How do I find out what the error codes shown in the WUPDate.log mean? For example:

18/03/2021 17:21:22 : [915] Download : https://www.skylogservices.co.uk/PRO/V7/Skylgpro.exe_NEW (Status:3) (Error:0)
18/03/2021 17:38:33 : [946] Cannot download update file : https://www.skylogservices.co.uk/PRO/V7/Skylgpro.exe_NEW (Status:2) (Error:9)

The error codes shown in the TWebUpdate Developers Guide are all 12XXX 5 digit codes.

This is the value of the GetLastError call performed to get the Windows error code for the last failing operation.
The result codes can be found here: