How can I gain access to the Windows 10 BitLocker encrypted drive on Mac OSX?

By default, we couldn't open, read and write a BitLocker drive on Mac. But take it easy, the BitLocker Genius tool is a really simple and user-friendly tool that can help you get access to the BitLocker drive without any data loss.

When you meet "The disk you inserted was not readable by this computer" error, you can click on Ignore button. I'm also a user that know little about computer. But I insert the drive to Mac and type my password then that drive is able to work normally.

Besides, you can unlock the BitLocker encrypted drive on Mac using a recovery key as well.

To the best of my knowledge neither Apple nor Microsoft offer a way to read a Bitlocker encrypted drive on macOS.

A little searching turned up a utility called "M3" from a company called M3 Data Recovery that purports to enable Macs to read Bitlocker encrypted drives.

Note that I have ZERO experience or knowledge of this utility, how good it is, how well it works, or anything else. So use it at your own risk.

Personally I'd just ask whoever sent you the encrypted drive to just put the files on an unencrypted drive. Or give them an ExFAT formatted USB key of sufficient size and ask them to put the files there.

If you have the password, and you know that the drive works in Windows, then I think the simplest way would be to borrow a computer with Windows and copy the files off the drive to another drive that you can use with your Mac. Alternatively, get a copy of Windows and run on your Mac with VirtualBox, VMWare, etc.., should be able to copy the files to your host Mac system with shared directory or something. It looks like you can download a Windows ISO here, which you would use to create the virtual machine on your Mac, not sure if you need a registration key just to install and load the OS, in my past experiences you've been able to get to the desktop without registering.