Long story.

I bought Windows 8, standard edition. I upgraded to Windows 8.1 a while back. Then I wanted to use BitLocker so I upgraded to Windows 8.1 Pro. My computer had problems so I wanted to reinstall Windows. I could not do it with the usual options in the OS (it was missing some files) so I used my Windows 8 disk to reinstall. I installed the updates so I could update to 8.1. Now I'm trying to apply 8.1 and it says the following:

"Turn off BitLocker because it isn't supported in the edition of Windows you want to install."

I had BitLocked my C: and D: drive. I erased my C: partition during reinstall but my D: drive is still there because that's where I store my data. It is still BitLocked and I can unlock it. However there's no way for me to actually turn off BitLocker on the drive.

Does anyone know a way to do this?

OK so I found something online.

Open elevated powershell and run the command:

"Disable-BitLocker -MountPoint "[drive]" "

It is decrypting the drive. Hopefully I can resume afterwards. I will let you know.

Does it help?

BitLocker Auto-unlock - Turn On or Off in Windows 8

No, since it's not the Pro version of Windows 8, the BitLocker parts of the UI are not showing, except to unlock the drive. I found a command to run in elevated Powershell and it's turning it off now, it's taking a while because it has to decrypt the drive.

OK so you can disable BitLocker via elevated Powershell.

Use this command:

Disable-BitLocker -MountPoint "[drive]"

This will work even if you don't have a version of Windows 8 with BitLocker included.

After the drive is decrypted, run Windows 8.1 update again and it will allow you to continue.

• Marked as answer by Cloakedboltz 14 hours 5 minutes ago

OK so you can disable BitLocker via elevated Powershell.

Use this command:

Disable-BitLocker -MountPoint "[drive]"

This will work even if you don't have a version of Windows 8 with BitLocker included.

After the drive is decrypted, run Windows 8.1 update again and it will allow you to continue.

• Marked as answer by Cloakedboltz Saturday, March 07, 2015 5:08 PM