how to recomplie executable sapb1 addon without source code

Hi All,

My files are a bunch of DI API dll, UI API dll, and the executable files. My client does not have the source code for the addon again.

We are upgrading the SAP B1 8.8 to 9.2 and the client wants to continuing running this addon on 9.2.

I have located the addon ard, registered it on the new system, but it is failing. I guess it is because the DI & UI API of the old system are not compatible with the upgraded system.

Now, I have replaced the old DI & UI API with the API from the 9.2 but still it is not working.

Please what can I do in this case.

Thank you in advance.