Starting with the v2018.3 release, the Core Activities Pack is split into two distinct packages,
UiPath.UIAutomation.Activities. This has been done with the intention of offering you more control over which activity versions you use in the execution of your automation projects. In correlation with the Project Dependencies feature, this split enables you to choose exactly the version of activities you want to use as a dependency for your project.
Whenever a project created with a version of Studio older than v2018.3 is opened with Studio v2018.3 or higher, the project is automatically migrated and the new System and UIAutomation packages replace the old Core pack.
Remember to properly migrate your processes when updating the 2018.3 UiPath Platform. The dependencies and activities installation algorithm has improved, which can cause conflicts when executing processes with packages installed from local feeds. If you encounter any issues while updating, check out possible solutions on this page. Also, remember to check out how to Open Projects Created with Previous Versions.
Once the migration is performed, you cannot revert the project to use the old Core pack.
Starting with Studio v2018.3 or higher, you cannot install the Core package from the Package Manager. However, rest assured that the
UiPath.UIAutomation.Activities packages contain all the activities that were in the old one. Additionally, from v2018.3 on, you can use any combination of activity packages regardless of what version of Studio you are using at that moment.
Once a project is published with v2018.3 or higher, it can no longer be executed by using a v2018.2 or lower Robot.
Please note that the location of the
tessdata folder which is used to install languages for the Google OCR engine has been moved from
%UserProfile%\.nuget\packages\uipath.vision. You can read more about installing and changing the language for the Google OCR engine on this page.
For more information on how this change impacts Studio, you can read more here.
The Core Legacy Activities pack (the
UiPath.Core.Activities meta-package) was created as a result of the Core Activities Split to ensure compatibility between Legacy Processes and Robot versions v2018.3 or newer. The Core Legacy Activities and Legacy Processes are defined as follows:
- Core Legacy Activities - The
UiPath.Core.Activitiesmeta-package is available starting with the v2018.3 release. It references the
UiPath.UIAutomation.Activitiespackages whenever a legacy process is executed by a v2018.3 or newer Robot.
- Legacy Process - A process created with Studio v2018.2 or lower which uses the former
UiPath.Core.Activitiespackage as a dependency.
While the Robot is resolving dependencies, it searches for the UIAutomation and System packs. If they are not available, it uses the Lowest Applicable Version runtime rule to determine what UIAutomation and System package versions to use, which needs to be greater than the default one.
If a different version of the
UiPath.UIAutomation.Activities package is needed for executing a process, the
UiPath.UIAutomation.Activities v18.3.6897.22543 package needs to be removed from the following locations and replaced with the required one:
- The Orchestrator feed.
- The default packages location -
%Program Files (x86)%\UiPath\Studio\Packages.
- The NuGet cache -
If the Robot machine has access to the Internet, then the Official feed from the
nuget.config file must be removed to prevent the Robot from downloading it again.
Read more about Managing Packages.
If you have processes created with Studio v2018.3.1 which were using the
UiPath.UIAutomation.Activities v18.3.6864.20582 package, you must open them in Studio and update the
UiPath.UIAutomation.Activities package. Read more about it here.
If you ever used Studio v2018.3.1 with legacy processes, the
UiPath.UIAutomation.Activities v18.3.6864.20582 package needs to be removed, as explained on this page.