Error: Only one instance of UltraTax CS is allowed to execute at any time

Scenario

You may get this error when opening UltraTax CS.
Error message
Only one instance of UltraTax CS is allowed to execute at any time.

Solution

Verify you've closed UltraTax CS. If the application icon is missing from your taskbar, try the following:
  1. Go to the
    Task Manager
    .
  2. In the
    Processes
    tab, find UltraTax CS
    2024
    or utw23.exe.
  3. Select all instances of UltraTax CS
    2024
    or utw23.exe, then select
    End task
    .
  4. Open UltraTax CS
    2024
    .
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