I think there's some confusion here with AWS Marketplace and Amazon WorkSpaces Product Catalog. AWS Marketplace provides a new sales channel for ISVs and Consulting Partners to sell their solutions to AWS customers. Licensing of products such as AutoCAD and AdobePremiere etc. is not done through AWS Marketplace. You need to work with your company's IT department to obtain those license and software.
For installation of the software on Amazon WorkSpaces, you also need to work with your company's IT department/Administrator to obtain permission to install software. Unless your IT administrator has given you Administrator privilege to the Amazon WorkSpace to perform these task.
Based on your question, I would recommend to first contact with the IT Department and find out who's responsible for the Amazon WorkSpaces deployment for your company. Thanks
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