• Install v. 4.1.10
• Install v. 4.1.15 update
• Replace the app’s executable with the crack for 4.1.15
• Block with Firewall, Little Snitch (MAC User)
• Disable update checking
• Absolutely do NOT update, EVER
• Update/install Adobe Air, if needed
• Install v. 3.x language packs
• Again, Do NOT update

If you're getting errors with Rosetta Stone when starting up the app, you're either blocking it with your firewall (DON'T DO IT) or it has access to internet some how..
1. Do NOT block the application with firewall (you will eventually get those error messages if you do..)
2. Uninstall it
3. Clean all traces of it
4. apply the stuff below into your HOSTS file, and THEN install Rosetta Stone (again).
DO THE FOLLOWING:
Add following lines to your HOSTS file:
#16.217.0.0 = *.ip.att.net
127.0.0.1 16.217.0.0
127.0.0.1 rosettastone.com
127.0.0.1 launch.rosettastone.com
127.0.0.1 amp.rosettastone.com
127.0.0.1 resources.rosettastone.com
127.0.0.1 updates.rosettastone.com
now you can allow Rosetta Stone to connect to internet, it's not going
anywhere else than to your own computer.. :-)