Update Qt/help/tools from archive without reinstall

[Linux777]

Hello!
Currently I have two options: reinstall software from offline archive, or update current installation via internet connection. I have very fast connection at home while slow connection at work + I need update 5 computers (we are using LGPL version).

It's not convenient to reinstall from offline archive, in contrary if updating 5 computers in case of slow connection is also painful. When updating I see "downloading *.7z". Is there any way to download files separately and place somewhere to make installer catch up these files instead downloading them?..