1 - Rejoin the client to AD with the -f option to overwrite the computer object with the new version.
For example: /opt/quest/bin/vastool -u adadmin join -f yourdomain.com
2-The following command should show the AD attributes for the object
/opt/quest/bin/vastool -u host/ attrs host/ 2>&1 | tee /tmp/attrs.out
3 - After AD replication has taken place check AD for the computer object displayed QAS version.