I have executable and companion .tds file with Borland style debug information, sources are not avaiable.
The question is how to load this Borland debug info into IDA ?

To my knowledge...

Ida 4.17 and above can load borland debug files.

Dunno about 4.15

Do this:

Go to datarescue
Download the 4.18 demo there
Try it in the same.

...Have Phun