If you get this error:
The following directories are not writable: * /var/www/mysite/wp-content/uploads/wpsc/downloadables/ * /var/www/mysite/wp-content/uploads/wpsc/previews/ * /var/www/mysite/wp-content/uploads/wpsc/product_images/ * /var/www/mysite/wp-content/uploads/wpsc/product_images/thumbnails/ * /var/www/mysite/wp-content/uploads/wpsc/category_images/ * /var/www/mysite/wp-content/uploads/wpsc/upgrades/ You won't be able to upload any images or files here. You will need to change the permissions on these directories to make them writable.
When you click on “Products” in WP e-Commerce, then I am about to make your day.
For whatever reason, the plugin isn’t able to create those directories itself. So first create the following files:
Then set those files to the correct permissions:
$ chmod -R 777 mysite/wp-content/uploads/wpsc/
Now click on “Products” and the error should be gone!.
One more thing
The final step is to secure your installation:
$ chmod -R 775 mysite/wp-content/uploads/wpsc/