Copy Updated AVG definitions to another computer

Situation:

I've installed AVG Anti-virus Free on two computers and I'm using Windows 7 on both. One of PCs is connected to internet and I use AVG online-update to update it time to time, but the second does not have any access to internet/network.

One way for updating the second one is the offline option: downloading new definitions from AVG website as a EXE pack and installing it using a USB flash disk drive. But the size of offline virus-definitions is really large and contains all of the virus definitions while I just need the updated and new definitions.

A good idea is using the definitions on first computer to update the second computer. But how?

Not a good solution:

Some guys on internet suggested that AVG saves new definitions in this path:

X:\ProgramData\avg9\update\download

then I would copy this folder to second computer and use Update from directory option in AVG.

The problem is the definitions in this folder is deleted whenever somebody request from AVG to delete temporary update files. Therefore, if somebody (maybe myself!) accidentally delete the definitions without copying them to second computer, the second computer misses the updates forever!

The Question:

However, it is clear that after deleting temporary updates, AVG is still updated on first computer, so it must keep new definitions somewhere else.

I want to know where and how I can use them to update the second computer.