title: Toad for Oracle, No valid Oracle clients found. You need at least one 64-bit client properly configured
body: <p>I get this error when I launch Toad for Oracle.</p>
  
  <pre><code>No valid Oracle clients found. You need at least one 64-bit client properly configured.
  </code></pre>
  
  <p>This has been happening since I upgraded the Oracle Client to Oracle 12c from 11g.</p>
  
  <p><a href="https://i.stack.imgur.com/xH8RK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xH8RK.png" alt="enter image description here"></a></p>
  
  <p>Here is what I have done so far to try to resolve it based on internet research:</p>
  
  <ol>
  <li>I checked the path variable, it's currently set to C:\xyz\Oracle\ora12.1\client_2\bin, and there is an Oracle installation at this path.</li>
  <li>I checked the TNS_ADMIN variable, it is currently set to C:\xyz\Oracle\ora12.1\client_2\network\admin. This also appears to be valid and correct, there is a tnsnames.ora file under this path.</li>
  </ol>
  
  <p>SQL Plus works without issues, and Oracle SQL Developer also works without issues.</p>
  
  <p>Is there anything else I can try to resolve this issue? Unfortunately, uninstalling and reinstalling Toad is not an option at this point as I do not have access to a new setup.</p>