malwarebytes Rescue Disk

[dcollins]

You can update offline Windows installations, you just can't do it the same way as updating the system you're currently using. It requires utilizing the API's differently, which most of these third party utilities aren't designed for. There are some updates that may have some system requirements as well, that may not be met in an offline environment.

[AlexSmith]

2 minutes ago, dcollins said:

You can update offline Windows installations, you just can't do it the same way as updating the system you're currently using. It requires utilizing the API's differently, which most of these third party utilities aren't designed for. There are some updates that may have some system requirements as well, that may not be met in an offline environment.

Pretty much this. For example, what you can do from an offline environment is manually provide the WU package file (generally a *.cab file) and apply to the offline OS installation using DISM.