FahCore_11 WUs have been out of supply for some time now. We have been working to see if there are scientific problems which would be well suited by this core, but the science has moved on (FahCore_11 is very, very old and does not support key new advances) and, as mentioned earlier, it is time to retire FahCore_11.
It’s worth mentioning that FAH GPU cores have evolved dramatically in the time since FahCore_11 came out, with Core15 being a major workhorse and Core17 (built on OpenMM) being in major release, and with new cores Core18 (with an updated version of OpenMM) and Core19 (with an updated backend infrastructure) in testing. We’re looking for a lot of exciting new results with these new cores.