What do you mean by Resume standard installation?

XIP package

Since 9.5 a XIP package is provided for the Standard flavor.

This is actually a zip file containing the required XWiki extensions for both the main wiki and subwikis, in the same format than the local extensions repository.

download it
Unzip it (rename it to .zip if your zip tool does not recognize it) in the folder <permanentdirectory>/extension/repository (if you get complains about already existing files don't overwrite them)
Restart XWiki if it was running
*Resume standard installation, this time it will find the flavor locally*

What Do u Mean by “Resume standard installation, this time it will find the flavor locally” ?

Well not really sure what more to add. When you start XWiki the first time it search for flavors to install and don’t find any when it does not have access to internet. Unzipping the XIP package is a way around this: this time it will find the XWiki Standard flavor.