I took a look, and it's not difficult to migrate the categories and products. Store settings i think you can do manually.
as an FYI, the original store and Alans WWStore use different tables, albiet with near-same structure; The WWStore has added functionality.
You can migrate them with some simple SQL Server TSQL commands in Query analyzer; if you don't have access to that, I don't have a simple solution; the TSQL below would be ideal if you have a lot of categories and products int he database, and don't want to reenter by hand.
in order for this to work, you cannot have entered any categories or products into the WWStore; just install the WWStore and then perform the commands below.
--migrate categories: manditory
SET IDENTITY_INSERT ON WWStore_Categories
INSERT INTO WWStore_Categories(CategoryID, PortalID, CategoryName, CategoryDescription, Message, Archived, CreatedByUser, CreatedDate)
SELECT CategoryID, PortalID, CategoryName, CategoryDescription, Message, Archived, CreatedByUser, CreatedDate FROM Store_Categories
SET IDENTITY_INSERT OFF WWStore_Categories
--migrate products
SET IDENTITY_INSERT ON WWStore_Products
INSERT INTO WWStore_Products(ProductID,PortalID,CategoryID,Manufacturer,ModelNumber,ModelName,ProductImage,UnitCost,Summary,Description,Featured,Archived,CreatedByUser,CreatedDate)
SELECT ProductID,PortalID,CategoryID,Manufacturer,ModelNumber,ModelName,ProductImage,UnitCost,Summary,Description,Featured,Archived,CreatedByUser,CreatedDate FROM Store_Products
SET IDENTITY_INSERT OFF WWStore_Products
Hope that helps