Upgrade User attempt from the DLO Server console pop-up
Information V-138-57364-7
Not found
Failed to run Desktop Agent Update.

Only users below 9.7 are impacted with this issue and the Upgrade User option should work fine for any user with version 9.7 and above.
For agents below version 9.7, follow the below workaround
Workaround:
Steps for upgrading agents below 9.7 -

3. On clicking Next, follow the instructions from How to install the Desktop Laptop Option agent to complete the upgrade.
Failed to run Desktop Agent Update for agents below version 9.7