Why keep files and apps option greyed out when upgrading to Windows 11

Keeping files and apps option greyed out when upgrading? Since you're already on Windows 10 Pro, using the latest Windows 11 (25H2), and have verified disk space and edition matching, here are some common causes and troubleshooting steps:

Possible Causes:
1. Presence of Incompatible or Unrecognized Software/Drivers
  Certain security software, third-party drivers, or system modifications can block in-place upgrades.
2. Corrupted System Files or Upgrade Components
  Corruption in system files or Windows update components may cause the setup to restrict options.
3. Pending Updates or System Changes
  Pending Windows updates or system changes might interfere with the upgrade process.
4. Custom or Non-Standard Partition Layout
  Partitions, especially recovery or OEM partitions, can sometimes cause restrictions.

Troubleshooting Steps:
1. Run the Compatibility Troubleshooter
   Open Settings > Update & Security > Troubleshoot > Additional troubleshooters.
   Run Program Compatibility Troubleshooter and Windows Update Troubleshooter.
2. Check for Pending Updates and Install Them
  Make sure Windows 10 is fully updated before upgrading.
  Go to Settings > Update & Security > Windows Update and install all pending updates.
3. Run System File Checker and DISM
  Open Command Prompt as administrator.
  Run: sfc /scannow
  Then: DISM /Online /Cleanup-Image /RestoreHealth
  Restart and try again.
4. Disable Security Software Temporarily
  Temporarily disable any third-party antivirus or security tools, as they can block upgrade components.
5. Check Disk and Partition Layout
  Use Disk Management (diskmgmt.msc) to verify that your partitions are healthy and properly configured.
  Avoid upgrading over encrypted or heavily customized partitions.