From http://labs.adobe.com/technologies/flashbuilder4/?tabID=details#tabTop
How long can I use Flash Builder 4 beta 2?
The beta 2 release of Flash Builder 4 will run for 60 days from
installation before timing out. You may continue your use of beta 2
after the first 60 days by entering a valid Flash Builder 4 extension
serial number. All current Flex Builder 3 customers will be emailed an
extension serial number. If you own a copy of Flex Builder 3 and did
not receive an email with an extension serial number, you may request
one online by entering your valid Flex Builder 3 serial number. Please
visit http://www.adobe.com/go/flashbuilderextension to request an
extension serial number.
If you don’t yet own Flex Builder 3 and want to continue using the
beta you will need to purchase a Flex Builder 3 license. By adding a
12 month maintenance plan with your purchase, you will receive a
free-of-charge copy of Flash Builder 4 when it ships.
2010/1/19 markflex2007 markflex2...@yahoo.com:
I try to use Flex Builder 3 sn,but it can not be accept.
Thanks
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