5.7 Do upgrade or update seats replace existing seats?
If during the update or upgrade process you are provided with a new serial number, then this update replaces the previous entitlement.
You must delete the previous FlexNet license key from all relevant computers and license
servers as a condition of receiving the update or upgrade license. This is because your
new license is a replacement seat, not an additional seat, and acquisition of the new
license automatically terminates the old one. Use of the old FlexNet license key in that
situation is not authorized by ARM or its licensors. If you instead require an extra
seat rather than simply upgrading or updating your existing FlexNet license key to
enable the latest version, then you must purchase a new seat licence, not an update or
upgrade. Quotations for new seats are available on request from ARM or your local ARM
ARM FlexNet license keys are backwards compatible. For example, a license for DS-5
5.15 also enables DS-5 5.14.