If you do not yet have Flex Builder 2 and Flex Data Services (FDS) installed, step through the following directions to install them.
Browse to the URL www.adobe.com/products/flex and click the Download Now link; download both the following:
Flex Builder 2
Flex Data Services 2
Install Flex Builder 2, accepting all the default options. The trial period on Flex Builder 2 is 25 days.
Install Flex Data Services 2, accepting all the default options. When asked for a serial number, leave it blank. This installs the Express version that does not time out.