Keep downloaded setup files (and download setup of installed apps)

In order to install PortableApps on some internet-less (or very-slow-internet) computers, I'd like to have a couple of options:
- download all setup files of my currenty installed apps (on my computer where I have a *fast* internet connection)
- keep setup files when I update my installed apps (see above)
I noticed that all those .paf.exe files are actually downloaded in a temp folder but they are automatically deleted when the update has been completed.

TIA for your help