This readme contains important information about Autodesk AutoCAD 2019 and Autodesk AutoCAD LT 2019.

Autodesk Trust Center

For the latest information regarding the security fixes in this Update, refer to the Security Advisory.

Before Installation

• Make sure that your Windows OS is updated before you begin to install AutoCAD 2019 or AutoCAD LT 2019.
• If it's not already installed, AutoCAD 2019 and AutoCAD LT 2019 installs Microsoft .NET Framework 4.7, which requires one of the following Windows update levels:
• Microsoft® Windows® 10 Anniversary Update (version 1607 or higher)
• Microsoft Windows 8.1 with Update KB2919355
• Microsoft Windows 7 SP1 with KB4019990
• For Windows® 10 editions, only the 64-bit version is supported.

DWGCONVERT, ETRANSMIT, and ARCHIVE Commands

• The ZIP option of the DWGCONVERT, ETRANSMIT, and ARCHIVE commands now create UTF-8 ZIP files, which uses the popular 8-bit form of Unicode for file names. This means that you can package files that have names with extended font characters. The file names will not display correctly if you use ZIP utilities that don't support UTF-8 ZIP files. Use a ZIP utility such as 7-Zip to correctly display and extract these files.

Feature-Specific Requirements

• The Model Documentation feature is supported only on 64-bit platforms.
• The Save To AutoCAD Web & Mobile feature is available only on 64-bit platforms.
• It is recommended that you use a 64-bit platform for computation-intensive rendering.
• Custom C++ applications created for a previous release of AutoCAD will need to be recompiled and tested due to the break in binary compatibility. This change is not relevant to AutoCAD LT.
• Starting with AutoCAD 2017-based products, BMP files no longer support the color value of 192,192,192 as a transparent color. Custom images that need to support transparency must now be saved as a PNG file.

Help Documentation

• The product Help documentation is available online and offline. The offline Help isn't automatically installed with the product. If you don't have a continuous connection to the Internet and want to install Help locally, you can install offline Help at the end of the product installation. Alternatively, you can download offline Help from the product Help menu when you have an Internet connection.
After installing offline Help, follow these steps to choose online or offline Help.
1. At the Command prompt, enter OPTIONS.
2. In the Options dialog box, on the System tab, click or clear the Access Online Content When Available option.
3. Click OK to apply the change and close the Options dialog box.

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