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The SDK is only available for purchase separately and I'm not sure it's even sold anymore. However I integrate with MAS 500 in a wide variety of ways and do not use the SDK for that. If you tell us what you want to do maybe we can help you.
First are you looking only to query data from the 500 database or are you also thinking of creating/modifying records? Also, what type of program are you looking to build (i.e. client that works within Sage 500 session, interface to another system, retrieve data for a website/web service, etc.)?
Depending on what data you want to look at, you can likely find what you are looking for in the BIE views. For example, if you go to Sales Order - Insights - Explore - Sales Order Lines, that BIE view uses the view vdvSalesOrderLine, which can been seen by clicking on File - Properties for that view.
Depending on what data you want to look at, you can likely find what you are looking for in the BIE views. For example, if you go to Sales Order - Insights - Explore - Sales Order Lines, that BIE view uses the view vdvSalesOrderLine, which can been seen by clicking on File - Properties for that view.