The Golden Rule for the versions of the different components is the following:
UVC >= UVMS >= Reporter / DU Explorer >= DUAS Nodes
DU Explorer: 6.9.21
DUAS nodes: some on version 6.9.01, some others on version 6.7.41, and the rest on 6.9.21 maximum
If you want to upgrade to DUAS 6.9.41, then you should first upgrade UVC/UVMS/Reporter/ Du explorer to that same version.