I recently purchased this TCAS add on by DBS Studio from 4SimShop, hoping it'd work for FSX Steam Edition as most other add-ons have (at least partially).
I installed this one perfectly fine; it located the correct installation path and everything. I opened FSX and on the loading screen I was greeted with the typical DLL activation for the add-on, and clicked yes. When I loaded an aircraft (I chose the simple Cessna that was listed as the default supported aircraft in the documentation, but nothing showed up and no option was available in the add-ons menu nor the instruments panel/windows dropdown.
I went into the default DLL.xml path and copied over the launch.addon to the new location in the FSX SE files, as this seemed to have fixed some other addons. It did not fix this, after relaunching.
I was also not greeted with an activation screen of any kind which is suspicious to me.
Any help would be greatly appreciated!