# Applying and testing a patch in Talend Studio

## About this task

Before applying the patch on a Talend Studio production branch, Talend recommends to first create and use a test branch for the patch testing.

Information noteNote: The following best practices only apply to projects managed with Talend Administration Center.

In the following steps:

* Studio\_1 refers to the current Talend Studio instance used for production.
* Studio\_2 refers to the Talend Studio instance used for testing the patch.

Availability-note[Deprecated](https://help.talend.com/r/en-US/Cloud/labels-on-talend-help-center/availability-deprecated)

This content is deprecated.

Apache Subversion is deprecated from 7.3.1 R2021-08 release onwards

## Procedure

1. Open Talend Administration Center and select the project you want to test the patch on.
2. Create a new branch named patch\_testing (or any other name) based on the production branch via Talend Administration Center. For more information on how to use Talend Administration Center to create a Git or SVN branch, see [Create a Git or SVN branch](https://help.qlik.com/talend/r/en-US/7.3/administration-center-user-guide/create-git-svn-branch). You can also create the patch\_testing branch without Talend Administration Center using Git/SVN.
3. Install another Talend Studio instance (Studio\_2) to test the patch.
4. Apply the patch in the Studio\_2 instance manually and launch it. For more information, see [Applying a patch to Talend Studio / Talend CommandLine](https://help.qlik.com/talend/en-US/migration-upgrade-guide/7.3/applying-patch-to-talend-studio).
5. Select the project in the patch\_testing branch.

   Information noteNote: If the project has reference projects, you need to log into the main project with the first Talend Studio instance (Studio\_1) to change the project reference to your test branch (in this example, patch\_testing) to make sure all the projects you test are on the patch\_testing branch. Then, use the Studio\_2 to migrate the reference projects before the main project.
6. A warning window appears, click OK to migrate the project to the new patch version.

## Results

You applied the patch to Studio\_2 and migrated your projects in the patch\_testing branch. You can now test the patch.

If the test is successful, you can apply the patch to the Talend Studio instance used for production (Studio\_1) and migrate other production branches via Talend Administration Center, see [Applying a patch to Talend Studio via Talend Administration Center](https://help.qlik.com/talend/en-US/migration-upgrade-guide/7.3/apply-studio-patch-via-tac).

If the test is not successful, please contact Qlik Support.