Does Touch lose Latest Update when I sink to new computer?

I've got to sync my sons ipod Touch to a new computer which is a PC.
It was originally synced to his sisters iMAC. And we've just recently purchaes that $20 update for the Touch. Can anyone tell me if when we sync to the PC will we lose the update, and will we have to re-download and pay another $20?
I've seen in other posts that when you've downloaded the update it is saved to a specific folder on the MAC. But can that same file be transferred to the PC if in fact it is wiped out when the Touch is synced to the PC?

If you have more than one iPod Touch associated with your iTunes you
will be able to apply the software upgrade to all units. You can not
apply the update to a Touch that is not associated with your library
and if you take an upgraded Touch to another library and do a
complete restore that upgrade will no longer be active.
The iPod touch January Software Upgrade can only be synced to iPod touch from the primary iTunes library. If the user is manually managing music and video on iPod, this is the computer where they first set up the iPod or first set it up after restoring the iPod. The "iPod touch App Pack 4A93.ipa" file can be copied from the computer where you purchased it to your primary iTunes library computer, and sync the iPod from there.
The file is located here:
Mac OS X:
~/Library/iTunes/Mobile Applications
Windows XP
C:\Documents and Settings\[user name]\Application Data\Apple Computer\iTunes\Mobile Applications\
Windows Vista:
C:\Users\[user name]\AppData\Roaming\\Apple Computer\iTunes\Mobile Applications\
Note: These locations are hidden by default in Windows. You can these locations by choosing "Show hidden files and folder" in the View tab of the Folder Options Control Panel.
Once you have copied the "iPod touch App Pack 4A93.ipa" file to the computer with your home library, make a new folder named Mobile Applications in the correct location, and place the "iPod touch App Pack 4A93.ipa" file there. Open iTunes and sync your iPod touch.

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