I created 4 private keys offline in Bitcoin-QT 9.0 via TailsOS. My client never touched the internet, do I need to bring my cold storage online to create 4 new wallets in 9.1?
Cliffs >
Downloaded Bitcoin-QT 0.9.0
Disconnected from Internet
Generated 4 Private Keys
Wrote them down
Formatted USB
Are my coins still safe or do I need to download 0.9.1 or w/e due to the bug
The bug is only a concern if your bitcoin-qt was connected to the internet. The bug allows someone to access areas of RAM over the internet to capture your private keys.
If the wallet that you used to generate the private keys was never connected to the internet while it was running, then you should be ok.
Just make sure, if you ever decide to import those private keys to spend any of those bitcoins, that you don't use 0.9.0 while connected to the internet.