After upgrading to this version, a Migration Assistant will launch to help migrate you from previous versions to the latest keychain format. Your original 1Passwd.keychain file will not be modified. Instead, a new 1Password.keychain file will be created for you. Once the upgrade to 2.5 is completed, the original 1Passwd keychain is no longer needed, but should be kept for backup purposes.
This is a FREE upgrade to all registered owners of 1Password!