Cannot downgrade my Flashbuilder to 4.6

Hi,
I installed flash builder 4.7 an hour ago and I found that there's no design view anymore. I'd like to use Flash Builder 4.6 since it has the design view. However, the system does not allow me to install 4.6. It always display this error ( please see the picture)
I've tried everything I could do, including uninstalling Flash Builder 4.7 and using the Adobe cleaner tool. Nothing worked. I suspect that somewhere in the file system has the record of the version. How can I remove it in order to reinstall Flash Builder 4.6? I really need your help. Thank you in advance

Here's the error description and cure:
Error 2, 4 (or -4), 6, 1000, 9006
Follow Troubleshooting security software. Often, uninstalling third-party security software will resolve these errors.
There may be third-party software that modifies your default packet size in Windows by inserting a TcpWindowSize entry into your registry. Your default packet size being set incorrectly can cause these errors. Contact the manufacturer of the software that installed the packet size modification for assistance or follow this article by Microsoft: How to reset Internet Protocol (TCP/IP).
Verify that access to ports 80 and 443 are allowed on your network.
Verify that communication to albert.apple.com or photos.apple.com is not blocked by a firewall, or other Internet security setting.
Discard the .ipsw file, open iTunes and attempt to download the update again. See the steps underAdvanced Steps > Rename, move, or delete the iOS software file (.ipsw) below for file locations.
Restore your device while connected to a different network.
Restore using a different computer.
This comes from here:
iTunes: Specific update-and-restore error messages and advanced troubleshooting

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