As of June 29, 2021
There may be problems running the ISAR SDK if the 'Version Control' package is present in Unity as the import of the file package.json (from the com.hololight.isar directory) cannot be done as usual. Also, no ISAR tab is displayed at the top of the tab bar.
Up to Unity version 2020.3.8 the package 'Version Control' is not automatically imported when creating a new project.
As of Unity version 2020.3.9, the 'Version Control' package is automatically imported.
In the Package Manager (Windows -> Package Manager) you must click on the package 'Version Control' and press the Remove button. Once the package is deleted, the integration of the ISAR SDK should work as usual (see ISAR SDK Guide on GitHub).