To offer the best user experience, DxO PhotoLab 4 is supported on all Windows versions supported by Microsoft.

To October 23, 2019, the operating systems support status is:

Source: https://support.microsoft.com/help/13853/windows-lifecycle-fact-sheet

Windows 8

To know which version of Windows 8 you are running, open the Control Panel -> System and Security -> System.

If your Windows version is "Windows 8" (and not 8.1) you need to upgrade to Windows 8.1.

Please visit the following link to get more information on how to upgrade: https://support.microsoft.com/help/15288/windows-8-update-to-windows-8-1

Windows 10

To know which version of Windows 10 you are running, you can execute winver.exe utility.

If your current Windows is not up-to-date, Microsoft lets you upgrade freely to the latest Windows 10 version.

Please visit the following link to get more information on how to upgrade: https://support.microsoft.com/help/4027667/windows-update-windows-10

Note:

In some situations, Windows Update service is unable to update to latest Windows 10 edition and/or indicates Windows is already up-to-date.
You can force the update to latest Windows 10 edition by using one of the following methods:

• Using Windows Update
  If you notice the text Some settings are managed by your organization in the Windows Update window, it means the updates policy is controlled by your organization/company. To update to latest Windows edition, you should contact your system administrator. Alternatively, you can click Check online for updates from Microsoft Update to check updates directly from Microsoft.
  
  

• Using Windows 10 update Assistant
  Another way to update Windows 10 is to download and launch the Windows 10 update assistant. This small utility is available on https://www.microsoft.com/software-download//windows10.
  
  If you own Windows 10 enterprise or Windows 10 education, the assistant will display an error message. In this situation, you have to contact your system administrator.