All valid previous version serial numbers for Surfer, Grapher, Voxler, Strater, MapViewer, or Didger can be upgraded to the current version at a rate that is discounted from the price of a new license. Upgrade prices can be found on each product's webpage.
To be eligible for upgrade pricing, the serial number must be registered to the purchaser and must not have been previously upgraded. If you're unsure if your serial number qualifies, please contact Golden Software.
Updated: January 25, 2018