AVEVA Historian Client 2026 release notes

AVEVA Historian Client 2026 is a major release.

The AVEVA Historian Client release notes describe applicable expectations and limitations, new features and enhancements, fixed and known issues, and documentation included in this release for Historian Client applications.

Expectations and limitations

The following expectations and deprecated features should be considered for this release of AVEVA Historian Client:

ActiveX controls deprecated by Microsoft

Microsoft has permanently disabled ActiveX controls by default in Microsoft 365 and Office 2024 due to ongoing security and compatibility risks. This means that embedded ActiveX controls in Word, Excel, PowerPoint, and Visio no longer work and are blocked without notification, often appearing as static, unclickable content. If you have legacy documents with older, embedded templates, you may run into unclickable content due to this.

If you have any legacy content affected, Microsoft recommends the following alternatives for migrating your disabled content:

• Office JavaScript (Office.js) Add-ins: The primary modern replacement using web technologies. Note that these only run within Office hosts and cannot be embedded in standard .NET or Win32 apps.

• Office Scripts: The recommended choice for automation scenarios, specifically in Excel.

• VBA and Form Controls: A viable alternative for desktop environments, though they will not work on Office for the Web.

Importing .NET controls

The following .NET controls require an additional step to be imported correctly:

• aaHistClientActiveDataGridControl

• aaHistClientQueryControl

• aaHistClientTimeRangePicker

• aaHistClientTrendControl

• aaHistClientSingleValueEntryControl

• aaHistClientTagPicker

Steps to import these controls:

1. Import the aaPKG files from: C:\Program Files (x86)\ArchestrA\Framework\Bin

2. Import the desired controls from: C:\Program Files (x86)\ArchestrA\Framework\Bin\AVEVA_Software_LLC_xxxxxx.dll

This process applies to both InTouch HMI and System Platform IDE applications.

Change in default REST configuration

By default, Historian Server 2026 requires trusted connections. This means that the address https://nodename:32573/ is the new default address for Historian Client Trend and its embedded controls.

The default address from previous versions, http://nodename:32569, is untrusted. To continue to use that address, change the REST configuration to "Favor trusted connections, but permit untrusted connections."

New features and enhancements

AVEVA Historian Client 2026 includes the following new features and enhancements:

Enhancements to Trend Data Log

The Trend Data Log has been enhanced to improve how trend data is captured, recorded, and accessed.

Improvements to entitlement access

Entitlement access has been improved to provide more reliable and streamlined control over user permissions

Enhanced SSO support

Single sign-on (SSO) support has been enhanced to provide a more seamless and consistent authentication experience when accessing Historian Client, particularly in environments integrated with CONNECT.

Users can now update .NET framework independently from the application

The product now allows updating the .NET framework independently of the application itself, decoupling framework updates from app updates.

Resolved issues

The following issues were resolved with this release:

Known issues

The following problems and enhancement requests have been deferred until a future release:

User documentation

Notice – Online help access: Historian Client 2026 does not include online help files or the AVEVA Help Viewer. Context-sensitive help calls now open the corresponding content on docs.aveva.com.

If internet access is not available, selecting a help link displays a QR code that you can scan with an internet-connected mobile device to open the help content.

All product documentation is still available in PDF format on the installation media, and is installed locally when you install System Platform.

The following user documentation is included in this release:

• Historian Client online help – Explains how you can use AVEVA Historian Client to view, explore, and interact with Historian data through Historian Client applications. Access to this help is available by pressing F1 when using the Historian Client applications.

• Single user guides in PDF form (included as part of the install):

  • AVEVA Historian Client User Guide. Explains how to interact with Historian data using Historian Client applications.