A year or three ago I installed the foo_upnp and foo_out_upnp components in Foobar200, though they never worked as expected (I got frequent audio dropouts and the expected gapless playback did not materialise). I gave up using Foobar2000 at this point.
Earlier today, I revisited Foobar2000, updated it to v1.4 and ran a check for component updates, as follows:
Help > Check for updated components > Updates found
This told me that updates were available for both foo_upnp and foo_out_upnp, so I clicked OK. The result for each of these components was the error message "(unknown -please apply changes to load)". Unfortunately, this message means nothing to me. Assistance would be much appreciated.