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Delphi 12.3 April Patch available

Delphi 12.3 April Patch available

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Embarcadero has released a patch for RAD Studio, C++Builder and Delphi 12.3

RAD Studio 12.3 April Patch provides quality improvements to the 12.3 release, focused on the Delphi compiler, the C++ 64-bit Modern toolchain, the RAD Studio 64-bit IDE and its debugger, the VCL library and other RAD Studio features. Installing this patch is highly recommended for all RAD Studio 12.3, Delphi 12.3, and C++Builder 12.3 customers.

This patch is about 333MB to download. The details of the fixes and changes are in the readme file listed below. Notice in particular the need to define an environment variable for debugging packages in the 64-bit IDE.

Patch Installation Process

GetIt-based installation steps for this deferred package are very similar to what already described in the past (see for example https://blogs.embarcadero.com/rad-studio-11-alexandria-patch-1-available/):

  • The patch availability is indicated in the Welcome page of the IDE
  • As an alternative, search for it in the GetIt Package Manager
  • Once you start the installation, it asks you to accept the patch EULA (which is the same of the product EULA) and it reminds you that you need to restart the IDE
  • As the actual process starts, it opens a console. Remember you might have to accept the UAC system prompt to proceed, even if it might sit behind the console window. The entire installation process takes place outside of the IDE, in a command line console.
  • Once the process is completed, the RAD Studio IDe should restart automatically

A couple of additional notices:

  • You have the ability to dismiss the patch and not be reminded about it in the Welcome Page any more, even without installing it.
  • If you install the patch via GetIt, the About Box in the IDE will indicate the patch has been installed.

In case you download the patch ZIP file from the my.embarcadero.com portal (where it will be available shortly), you’ll have to install it manually, following similar steps of the automated install: the details are in the readme file included in the installation. You need to manually close the RAD Studio IDE before you install the patch (you’ll see an error if the IDE is running). Also, keep in mind that in case of a manual installation, the about box won’t reflect the patch status.

RAD 12 April Patch Readme

April 22, 2025

RAD Studio 12.3 April Patch provides quality improvements to the 12.3 release, focused on the Delphi compiler, the C++ 64-bit Modern toolchain, the RAD Studio 64-bit IDE and its debugger, the VCL library and other RAD Studio features.

Installing this patch is highly recommended for all RAD Studio 12.3, Delphi 12.3, and C++Builder 12.3 customers.

Installation via GetIt

If you download the patch via GetIt, it is installed automatically, creating a backup of the files replaced. The download happens in one of the steps of the console window (this may take some time depending on your connection speed).

Note: The patch includes an updated version of PAServer. This is copied to the patch download folder, and you need to copy it over to your target devices (Mac, Linux, Windows) and install it manually there.

In addition, for debugging packages in the 64-bit IDE, you should set the LLDB_DCP_SEARCH_PATH environment variable to refer to the libwin64debug folder, with a command like:

And then run bin64bds.exe from the same command line.

Manual Download and Installation

This patch is also available in the download portal at my.embarcadero.com. Locate the  RAD Studio 12.3 April Patch file and download it. After unzipping it, you can run the batch file or you can manually expand the embedded ZIP file in the respective subfolders of the RAD Studio installation folder.

You’ll have to copy PAServer and install it on your target device and set the LLDB_DCP_SEARCH_PATH environment variable as explained above.

Uninstallation steps (for GetIt installation)

To uninstall the patch and revert back to the 12.3 original version:

  • Open the Catalog Repository installation folder
  • Run patch.R123.hotfix.april_uninstall.bat
  • Only *after* you have cleared the patch, uninstall the package from GetIt

Quality Portal issues and other issues addressed by the RAD Studio 12.3 April Patch

Delphi Compiler and Toolchain

This patch addresses a compiler speed issue along with a change in the use of the record constraints for generic types:

https://embt.atlassian.net/servicedesk/customer/portal/1/RSS-3163

https://embt.atlassian.net/servicedesk/customer/portal/1/RSS-3102

https://embt.atlassian.net/servicedesk/customer/portal/1/RSS-3309

Modern C++ 64-bit Compiler and Toolchain

The patch contains a variety of quality fixes in several areas overall.

The patch addresses the following publicly reported issues:

https://embt.atlassian.net/servicedesk/customer/portal/1/RSS-3056

https://embt.atlassian.net/servicedesk/customer/portal/1/RSS-2708

64-bit RAD Studio IDE

For the 64-bit RAD Studio IDE we added support for ExpertsCreators, addressed an issue running on a Windows ARM VM in Parallels Desktop, and included many improvements to debugging 64-bit Delphi apps in the 64-bit IDE overall.

The patch also addresses the following publicly reported issues related to key bindings:

https://embt.atlassian.net/servicedesk/customer/portal/1/RSS-3169

Additional Reports

The patch addresses the following publicly reported issues for Android services and VCL styles, and an issue when creating Delphi ActiveX libraries:

https://embt.atlassian.net/servicedesk/customer/portal/1/RSS-3108

https://embt.atlassian.net/servicedesk/customer/portal/1/RSS-3149

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