How do I upgrade from Red Hat Linux 7.x, 8.0 or 9 to Red Hat Enterprise Linux?
Updated -
If you have a current subscription to Red Hat Enterprise Linux 2.1 or 3, it includes Red Hat Network (RHN) access to download your ISO images for new installations.
Access to the new release does not expire so you can upgrade at any time that suits you (provided you still have a valid subscription). Upgrades from Red Hat Linux versions 7.x, 8.0, 0, ...
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