How can I stop iOS3 iPod Touch v1 apps being removed when iTunes updates apps with iOS4 apps

Question

I have an iPhone 4 with iOS5 whilst my old iPod Touch Mk1 still runs on iOS3. My old iPod now rests in the handbag of my wife who will use the installed apps if she is near a wifi she can use. There is however an increasing problem in that wheras it is more than capable whilst running the old apps iTunes is automatically upgrading them as new versions are released and increasingly upgraded apps only support iOS4 +. The obvious answer of buying a new iPod does not compute, its a good iPod and despite years of regular use the battery life is more than reasonable and the iPod function wit h16gb is more than adequate so I refuse to commit it to the silicon graveyard yet ( i still run old G3 and G4 macs as servers and have an old Classic that still provides amusement at parties).
If however this automatic upgrade and trashing of old apps continues it will not be long before one day we sync the ipod and find it wipes al lthe apps off as they are no longer iOS3 compatible. Anyone ever found a way to protect the apps of an iOS3 device whislst all ipods are synced from the same iTunes user account?

Answer 1

There really is not god way.  Whatyou migh consider it sonnecting the iPod to a different computer and transfering purchases to the computer.  That way yu will still have the version of the apps that are compatible with the iPod.
iTunes Store: Transferring purchases from your iPhone, iPad, or iPod to a computer
At a later date if necessary you can delete the newer apps from the library of the syncing computer and put the older ones in and do what you want to the iPod.