dssx file requires product key 001L2. When the product key changes, it is important that you know this change, because any existing AutoCAD systems that you have installed will not be able to access the new version when you upgrade your system unless you reconfigure those systems to use the new product key. (For more information, see "Reconfigure Your Autodesk Products to Use a New Key," earlier in this chapter.)
If you are installing an upgrade of a previous version of AutoCAD, be sure that you use the same product key for both your current installation and for your upgrade. Using the wrong product key for an upgrade will prevent your upgrade from running successfully.
* Choose Install or Upgrade.
3. Follow the instructions that appear on the screen. If you select Upgrade, your existing AutoCAD software will be deleted and replaced by the software that you are upgrading. (You can always retrieve your files and software from the system.) You will then be prompted to enter a product key, which will be the same as the product key that was associated with the version of AutoCAD that you are upgrading.
## Upgrading Autodesk Subscription Versions
Upgrading an Autodesk subscription product is easy if you are using AutoCAD 2016 or later. You don't need to purchase the product for a specific reason. You simply pay for what you are currently using. In some cases, you may need to purchase an additional component to be able to use your current product. For example, you may need to upgrade to the Design Review feature to be able to use your current version of AutoCAD.
You can either upgrade all your subscriptions at once, or you can upgrade one at a time. Let's look at an example of how to do each:
1. If you have more than one subscription, go to the Subscriptions and Pricing option, click the Upgrades button, and choose Upgrade on the Subscription list. You can do this either through the Autodesk Central website or the Autodesk Customer Care website. If you have multiple subscriptions, the choices will be based on your home country.
2. If you have more than one subscription, the Upgrade Wizard will open, showing you the Subscription summary page for each subscription.
3. Note the product key for your AutoCAD subscription.
4. Click the Upgrade button.
5. On the next page, the Customer
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