Strictly speaking you need to purchase the Prof-UIS interface library to compile the IDE. However, if it's the runtime crashing, you don't need Prof-UIS (nor ProfUIS284ym.lib) to compile the runtime, but you will need the DirectX 9 SDK. Debugging the IDE won't actually help if the runtime is crashing.
Which module is the crash in? If it's a .csx that should tell you which plugin the crash is caused by. You could also try running the .cap via 'Debug application' in Construct, and see if it can tell you any more about the crash.