link to download DTW in marketplace

Hi,

I've been looking to download DTW for my SAP - 2005A (6.80.320) SP01 PL39. If I do a search for DTW in SAP Software Distribution Center, all I got is DTW 1.1 and 6.5. Based on their description, these files are just upgrades and patches. But I downloaded the 6.5 version anyway, tried to run it, and got error message "connection to SBO-Common has failed". I've looked for solutions in this forum regarding this error message, but none can solve my problem.

How can find I the link to download the main DTW program (not upgrade)?

Is there DTW for my SAP version?

How do I know which version my DI is?

Thanks for any hint!