What is Autodesk App Manager?
The Autodesk App Manager is an online resource where you can browse and purchase Apps (including product-specific content such as models, training materials, and eBooks) – and is available to several Autodesk Products. You can download some items for free, and some for a price. Purchasing is handled via PayPal at this time. Purchases and downloads can be tracked online, or by using the Autodesk App Manager.
How does Autodesk test and certify the Apps?
Testing starts with the standard testing that is used for all Inventor Certified Applications. Once the App is shown to meet the testing standard, the App is approved for publishing.
Click here to review the Autodesk App Store Product Guidelines and Requirements.
To access Autodesk App Manager: From the ribbon: Tools tab 
Options panel Autodesk App Manager.
How do I access the Autodesk App Manager and the Autodesk App Store?
You can directly access the Autodesk App Store website here: https://apps.exchange.autodesk.com/.
To access Autodesk App Store from within Inventor: On the upper right-hand corner of Inventor, click the Autodesk App Store icon.
How do I maintain and update the Autodesk App Manager?
Use the Autodesk App Manager to view, update, uninstall and get help on apps downloaded from the Autodesk App Manager website. Click here to learn more about the Autodesk App Manager.