Autodesk Revit LT 2019.1 Update Readme

Thank you for downloading the Autodesk® Revit® LT 2019.1 Update.

This readme contains the latest information regarding the installation and use of this update. It is strongly recommended that you read this entire document before you apply the update to your licensed copy of Autodesk Revit LT 2019. After this update is applied successfully, the build number specified on the Help > About dialog will be For reference, you should save this readme to your hard drive or print a copy.

Issues resolved by this update

This update addresses issues and crashes reported directly to Autodesk and contains the fixes included in the Revit LT 2019.0.1 Hot Fix. Consult the release notes for all areas improved by this update.

Additional software included in this update

With this install the following will be updated: Revit LT 2019, Collaboration for Revit 2019, and Personal Accelerator for Revit.

Known issues after applying this update

If Revit 2019 and Revit LT 2019 are installed side-by-side and the 2019.1 Update is only applied to one of these products, a "Could not load type 'Autodesk.Revit.DB.ICloudExternalServer' from assembly" error will be displayed when launching the non-updated product. To alleviate this error, make sure to apply the 2019.1 Update to both Revit and Revit LT in side-by-side configurations.


  • Who should install this update?
  • Supported operating systems
  • General installation information
  • Installation instructions

    This update is for the following Autodesk products running on all supported operating systems. Be sure to install the correct update for your software.



    Autodesk Revit LT 2019


    AutoCAD Revit LT Suite 2019


    (Note that this update will only update the Revit LT 2019 portion of your suite product.)

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    This update can be used with the following operating systems:

    • Microsoft® Windows® 7 64-bit (Enterprise, Ultimate, Professional, or Home Premium)
    • Microsoft® Windows® 8.1 64-bit (Enterprise or Professional)
    • Microsoft® Windows® 10 64-bit version 1607 or higher (Enterprise or Professional)

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    Before you begin

    As you prepare to install this update, keep the following in mind:

    Administrative privileges

    In order to apply this update, you must have administrative privileges to install and uninstall products.

    Product media

    Under some circumstances, you may be asked to provide the original installation source.

    If you installed Autodesk Revit LT 2019 from the DVD or USB, you may be asked to insert the disk or USB during installation of the update. Please have the disk or USB available before starting.

    If you downloaded and installed Autodesk Revit LT 2019 from the web and later deleted the extracted files (default location of extracted files is C:\Autodesk\WI\Autodesk Revit LT 2019), the update installation may not be able to continue. In that case, you should follow these steps:

    1. Obtain the Web download file and save it to your computer.
    2. Double click the download file and allow it to extract its files, noting where they are being saved.
    3. When the Autodesk Revit LT installer screen appears, click "Cancel".
    4. Continue with update installation as described in the installation instructions.

    Backup custom files

    Back up all customized files, such as Revit.ini, before starting.

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    Apply this update to an existing installation

    Follow these instructions to install this update on a single computer.

    1. Download Autodesk_Revit_LT_2019_1.exe and save it to any folder.
    2. Ensure the original product installation media is available.
    3. Find the folder where you saved the update and double-click the EXE file.

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    Uninstall this update

    Note: This update cannot be uninstalled to revert Autodesk Revit LT 2019 to its pre-update state. If you need to remove the update, please uninstall Autodesk Revit LT 2019 and then reinstall it.

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