Installing the software using Bootcamp assistant is not an option unfortunately, since Bootcamp on MacOS Catalina only supports installations of Windows 10. Now I know that the ISO file is working at least. I installed Windows 7 using that ISO in a virtual machine (Virtual Box), but I decided I want to Install it to run on its own. I have an ISO file for Windows 7 64-bit that I downloaded.

I know this is quite the challenge but I love the OS too much not to give it a try. Start the Oracle VM VirtualBox Guest Additions wizard, select shared folder in Browse for Folder window.I want to install Windows 7 on my MacBook Air running MacOS Catalina.

Select Next to run VBoxWindowsAdditions exe.

Prompt appears – CD Drive D: VirtualBox Guest Additions, click on message.

From the Virtual Box Menu Bar (not Windows 10 menu) select DEVICES – Insert Guest Additions CD Image….

Open Virtual Box, run Windows 10, log into your account.

INSTALLING VIRTUALBOX GUEST ADDITIONS PACKAGE When you want to run Windows again in Mac OS X, just launch VirtualBox again, select your Windows 10 virtual machine, and click the “Start” button to boot Windows in the app.

When you’re finished, quit VirtualBox like any other application and Windows 10 will shut down.

When setup is finished, Windows 10 will be running in VirtualBox.

Go through the standard Windows 10 installation experience, this can take a little while but eventually you’ll create a user account, select a user name, and do some basic Windows configuration.

In a moment or two you’ll be in the Windows 10 installer, select your language and click “Next.”.

Since there is no drive or OS installed yet, you will be asked to choose a virtual optical disk, click on the Folder icon and choose the Windows 10 ISO, then click “Start.”.

Back at the primary VirtualBox screen, choose “Start” to boot the new Windows 10 volume.

Select to create a new virtual hard drive, then choose Continue again.

Name the new virtual machine “Windows 10 VM” (or something equally obvious), select “Microsoft Windows” as the type and choose “Windows 10” as the version, then choose Continue.

Open VirtualBox and click on the “New” button to build a new virtual machine.

Open the disk image dmg file and double-click on the uninstall icon shown.

Save the DMG file, which is needed to uninstall Virtual Box.

After installation, you can find an Oracle VM VirtualBox icon in the “Applications” folder in the Finder.

This will start the installer, which enables you to select where to install Oracle VM VirtualBox.

A window opens, prompting you to double-click on the VirtualBox.pkg installer file dis-played in that window.

Double-click on the DMG file, to mount the contents.

Download VirtualBox installation DMG from, select OS X hosts.

Install windows 7 virtualbox mac