does the [UPGRADE for SELECT (DL)] means it will upgrade to KOMPLETE 13 SELECT, or will it be the full version of KOMPLETE 13?
In other words: If you own Komplete Select, choose this and you can upgrade to Komplete 13 for a reduced price ($399 instead of $599).
Other examples:
it means that the Base product you are upgrading to the full version from is "Select". If you have an account, log in and it will tell you if you qualify based on your currently registered products (there are different prices dependent on your upgrade path as well) if you have other concerns, I would get in touch with "Order Support" here...
Webshop & Orders – Native Instruments (native-instruments.com)