Until you register (ie, purchase) Friday, there are several limitations:
Otherwise, the free version of Friday is identical to the registered version. When you purchase/register Friday, you'll be able to continue working on your FAQ uninterrupted. You won't have to re-install anything or re-do any of the work you've done.
To purchase Friday, follow the instructions here:
How to register Friday
Naturally, all content & site maintenance by
Friday The Automatic FAQ Maker