Did you set yourself up as a 3rd Party Software company with Radiant Systems? There is a fee associated with doing this, but they provide documentation, software and access to their software team for questions like this.
Aloha Versions 6.2 and above also require the end-use to purchase a license to use the com interface. Prior versions, it was provided at no charge.
The tlb files should be in the BIN folder off of Aloha. If they are not, perhaps the reseller you are working with can provide them?
-Bill