Hello 
Default zypper behaviour is 1st retrieving, then installing packages (man mentions a different way tough …) , i know there’s a parameter somewhere that can be changed.
Instaling while downloading is a big request in open fate : do you know if it’s implemented yet, or rather soon to be ?
cheers
from man zypper :
–download-in-heaps
**TODO. **Download a minimal set of packages that can be installed without leaving the system in broken state, and install them. Then download and install another heap until all are installed. This helps to keep the sys-
tem in consistent state without the need to download all package in advance, which combines the advantages of --download-in-advance and --download-as-needed.