After downloading Adobe Flash Builder 4, I found a lot of registration codes online. Many of them are invalid, or they can be verified at the time, but the registration code will become invalid after the system is connected.
I tried to flip the web page and finally found a solution, so I did not dare to share it with others.
1. First open the file C:/Windows/system32/Drivers/etc/hosts and add
127.0.0.1 activate.adobe.com
127.0.0.1 practivate.adobe.com
127.0.0.1 ereg.adobe.com
127.0.0.1 activate.wip3.adobe.com
127.0.0.1 wip3.adobe.com
127.0.0.1 3dns-3.adobe.com
127.0.0.1 3dns-2.adobe.com
127.0.0.1 adobe-dns.adobe.com
127.0.0.1 adobe-dns-2.adobe.com
127.0.0.1 adobe-dns-3.adobe.com
127.0.0.1 ereg.wip3.adobe.com
127.0.0.1 activate-sea.adobe.com
127.0.0.1 wwis-dubc1-vip60.adobe.com
127.0.0.1 activate-sjc0.adobe.com
And save.
2. Enter the following registration code (I only tried the first one)
1424-4258-9368-0713-8534-5128-
1424-4806-8312-7960-9510-3669-
1424-4906-4326-2533-7393-8444-
1424-4843-4086-5932-4209-3746-
Source: http://blog.csdn.net/xiage/article/details/5833219