Support for such operations was an upgrade option rather than being a standard feature.

Each class has its own upgrade paths and costs of upgrade options.

The upgrade options themselves became user-selectable, giving the player more control over the heroes' development.

More complex systems are offered as an upgrade option, but come with monthly fees.

Our full review of that upgrade option is coming soon.

Packaged in two configurations and one upgrade option, it will allow users to choose between feature sets.

Upgrading a certain element still makes alternative upgrade options unavailable.

For end-users, the processor offers a potentially attractive upgrade option.

The 3.5-liter engine became available as an upgrade option for the ESi trim level.

At present, they are widely available as an upgrade option, with adoption in the low percentages and slowly climbing.