Hi Harry,
There are at least two ways to update vDos-lfn to the latest build, either automatically or manually.
1. If you want to try update using U2's VDLUPD command, then "vDosDir=" must be set. It is located near the bottom of the file XYWWWEB.REG, under the section [vDos-lfn,vDosXy]. Change and save it and try again. U2 is being maintained by Carl.
2. If you want to update by yourself, simply download the file vDos-lfn-201511.zip (for the 2015.11 branch) from the following URL. The file is being updated from time to time. Extract the files vDos-lfn.exe and README.TXT from the zip file and replace the old ones. Then you are done.
Wengier