Tried is again, with allowed overwrite set to yes. It gets a bit further, but stalls:
Importing Product, Please Wait...
[:]
Updating Version Number To: 1.0.0
Created Table: dbtech_vbshop_category
Created Table: dbtech_vbshop_purchase
Created Table: dbtech_vbshop_gift
Created Table: dbtech_vbshop_item
Created Table: dbtech_vbshop_purchase
Altered Table: administrator
Altered Table: user