It is not working because
it is not JSGME ready. So do one of the following: take the Umark.dds file from the download you have and put it directly into the data-
misc ( put it here in the
misc folder, you will be asked to
overwrite the
existing one ), make a back-up the original if you want to just in case.
Or create a JSGME compatible one and activate it through JSGME. So....Smaller Marker Mod-Data-Misc ( the last one is where you put the Umark.dds file ) put it into JSGME, activate it and you are good to go
RDP