@Michael Ombima
Hi,
BitLocker is unavailable for Windows 7 Pro and it cannot be downloaded and installed. It is available for Windows 7 Ultimate and Windows 7 Enterprise editions
For more information, you may refer to the following link:
https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-7/dd835565(v=ws.10)?redirectedfrom=MSDN
Hope above information can help you.
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.