So in essence, you pay the price difference when upgrading from one license to another?
i.e. If I have S1 and wish to upgrade to S2, I would need to pay S2-S1 =18-9= 9£ ? Is that correct, or would I need to pay full price for S2, and again full price for S3?
Sorry for hijacking the thread, I thought I would save the forum some extra clutter by using an old one.