The implementation of the feed uses Excel's RTD mechanism. An add-in that uses the feed infrastructure therefore has some runtime requirements on any machine where it is to be used.
Excel's RTD mechanism is only available in Excel XP upwards (Excel XP/2002, Excel 2003, Excel 2007 and Excel 2010). It cannot be used with Excel 97 or Excel 2000.
The model uses a COM module (XllRtdFeed.dll) to support Excel's RTD mechanism. You should deliver the RTD server module XllRtdFeed.dll to the target computer, and register it, e.g.:REGSVR32 "C:\Programs\InstalledAddins\Shared\XllRtdFeed.dll"
Ensure that you register the correct version of the DLL: on a machine with 64-bit Excel, you should register the 64-bit version of the file, which can be found in redist\x64, whereas on a machine with 32-bit Excel, you should register the 32-bit version of the file, which can be found in redist\win32.