If you still have the installation discs and a computer with a disc drive (or an external one), you can install the software. Once installed, the software will ask for your activation code.
Older versions of Rosetta Stone (pre-2014) often struggle to "handshake" with modern internet protocols. If you get an "Unable to contact activation server" error: Temporarily disable your firewall. Ensure your system date and time are accurate. old rosetta stone activation code
In 2020-2024, Rosetta Stone ran a quiet "Legacy Upgrade" program. If you contacted support with proof of an old activation code (a photo of the CD or sticker), they offered a significant discount (sometimes 50% off) on a 1-year subscription. If you still have the installation discs and