Keep old apps running
Some older products won’t work, here’s how to keep them
Add the installer
If this is your first virtual machine, starting VMware Fusion displays this window, into which you drop your copy of the Install macOS Sierra app. If you already have a virtual machine, choose File > New to display this window.
Set the destination
macOS is installed into the Macintosh HD virtual drive within the machine. Provide your Apple ID if you want to connect to the Mac App Store. That’ll require the usual authentication, as if this were a new Mac.
Add a shared folder
Click on the spanner in the toolbar, select Sharing, turn on this feature and then click the + button to add a shared folder. This provides the best way to share and transfer files between the two versions of macOS.
Once the virtual machine has been set up, Fusion will proceed with the lengthy macOS installation process. At times it may appear to restart the machine in Recovery mode. When it does, select Install macOS and click Continue.
Install VMware Tools
To install VMware Tools so you can move files between Sierra and High Sierra, choose Virtual Machine > Install VMware Tools. A disk image will mount; run the installer that’s in it. Sierra will restart with the tools running.
Download Sierra’s 10.12.6 Combo Update ( bit.ly/126co) in the VM if it’s using High Sierra’s internet access, or in High Sierra and transfer via the shared folder. Install it, then your apps. You can run Sierra in a window or full screen.