Broken link in FlashBuilder 4.7/Project Properties/Flex Theme/Find more themes

Issue: link "Find more themes" leads to 404 error

Reproduce:

1. Open Flash Builder 4.7
2. File/NewFlex Mobile Project
3. Menu: Project/Properties
4. Click on "Flex Theme"
5. Click the "Find more themes" link
6. Delight in a 404 error page