Can I downgrade from SQL Server Enterprise to SQL Server Enterprise 2005
Yes, Microsoft provides downgrade rights for SQL Server Enterprise.
Can I downgrade from SQL Server Enterprise to a different version of SQL Server, such as SQL Server Standard
No, Microsoft does not allow downgrades to versions of software restricted by the 90-day physical processor rule. The 90-day physical processor rule requires software to be associated with a specific processor for at least 90 days.
How can I mount or access a CD from the instance?
Select from the following:
To create an ISO image out of the CD, upload it to your Amazon S3 bucket and download it to the instance. Then, use any standard ISO mounting tool to access it.
To use Remote Desktop, specify the CD ROM drive letter from the Local Resources tab of the Local Devices and Resources page on the Remote Desktop client.