If you use the old scheme licensing (version plus upgrade), you can switch it to a Toolbox subscription license. The cost of switching depends on the product, your existing product version and product edition.
In the Team or Organization view, the Upgrade link is displayed next to all licenses that can be upgraded. In the Product view, you can select licenses to upgrade using either the selector on the left or the check-boxes next to specific licenses, and then choose the appropriate Upgrade option. You can click this link to go to JetBrains eStore and complete the order. If you have any questions, please contact Sales.