After installing update Revit 21.1.10.26 (21.1.1 Hotfix) <a href="https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2021/ENU/RevitReleaseNotes/files/2021updates/RevitReleaseNotes-2021updates-2021-1-1-html-html.html">https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2021/ENU/RevitReleaseNotes/files/2021updates/RevitReleaseNotes-2021updates-2021-1-1-html-html.html</a>) we have seen that the registry sometimes get a corrupt value on the Install location.
Check the HKLM registry under the SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{7346B4A0-2100-0510-0000-705C0D862004} key and the "InstallLocation" value. It should say something like "C:\ProgramFiles\Autodesk\Revit2021\".&nbsp;
If it only says "Revit 2021\", it means that the Autodesk's upgrade has not been done correct.
<img style="float:none;height: undefined;width: undefined" alt="undefined" src="https://t-images.imgix.net/https%3A%2F%2Fapp-us-east-1.t-cdn.net%2F5fa14016f052254af4073f99%2Fposts%2F608336d740f65dfe16d17028%2F608336d740f65dfe16d17028_82644.png?width=1240&amp;w=1240&amp;auto=format%2Ccompress&amp;ixlib=js-2.3.1&amp;s=874682b4cd50b45fdeab66d33259db6d">

<img style="float:none;height: undefined;width: undefined" alt="undefined" src="https://t-images.imgix.net/https%3A%2F%2Fapp-us-east-1.t-cdn.net%2F5fa14016f052254af4073f99%2Fposts%2F608336d7e3a3960bb5c36740%2F608336d7e3a3960bb5c36740_73691.png?width=620&amp;w=620&amp;auto=format%2Ccompress&amp;ixlib=js-2.3.1&amp;s=d990ac20fde6f9c91f2dd9e2c6f6fa2c">

<img style="float:none;height: undefined;width: undefined" alt="undefined" src="https://t-images.imgix.net/https%3A%2F%2Fapp-us-east-1.t-cdn.net%2F5fa14016f052254af4073f99%2Fposts%2F608336d7b9865d8023a4b347%2F608336d7b9865d8023a4b347_99760.png?width=620&amp;w=620&amp;auto=format%2Ccompress&amp;ixlib=js-2.3.1&amp;s=6339cf122b9d85c32bcebabde7e99130">

After installing update Revit 21.1.10.26 (21.1.1 Hotfix)  https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2021/ENU/RevitReleaseNotes/files/2021updates/RevitReleaseNotes-2021updates-2021-1-1-html-html.html) we have seen that the registry sometimes get a corrupt value on the Install location.
Check the HKLM registry under the SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{7346B4A0-2100-0510-0000-705C0D862004} key and the "InstallLocation" value.  It should say something like "C:\ProgramFiles\Autodesk\Revit2021\". 
If it only says "Revit 2021\", it means that the Autodesk's upgrade has not been done correct.
 

 

 



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