This is the Spry Homepage. On that page you will find a link
to download the Spry Updater Package. Inside the package you will
find a bunch of samples and an Extension. Install the Extension and
restart DW. Then under the Sites menu you will see an option to
update your Spry code. Run that update.
Now seeing as how you renamed the SpryAssets folder, it may
not update your menu properly. I would highly recommend renaming
the folder back to the default before proceeding because I am not
100% sure if the script searches out the files or the folder (which
would have the files inside).
Then once that is done you would need to re-upload the
SpryAssets folder (or whatever name you give it).