November 10, 2008

"Invalid serial number" when upgrading to Flex Builder 3 Pro

Ok this was annoying…I had an older trial version of the standalone Flex Builder 3 on my system (Mac 10.5) and wanted to activate it with a new serial for FB3 Professional.

Whenever I entered the serial in “Help -> Manage Flex Licenses” I kept getting a message saying “Invalid serial number” even though it was a brand new serial. Damn.

Mark gave me the original hint to remove the file under /Library/Application Support/Adobe/Flex but FB wasn’t re-creating it when I entered my serial on startup. I needed to create the file manually and enter my serial number. These steps got me going:

  • cd /Library/Application Support/Adobe/Flex
  • sudo touch (create the file)
  • sudo nano (edit the file)
  • enter the following “flexbuilder3=xxxx-xxxx-xxxx-xxxx-xxxx-xxxx” (where xxx etc is your actual serial)
  • restart Flex Builder

Also thanks to for the post.

© Michael Sharman 2017