VMware Fusion on Mac for Running Windows in a VM
Steps to install Windows on your Mac using Fusion
Additional Details at Mac Users
STEP 1 - Request and activate your VMWare account (free of charge)
STEP 2 - Download and install Fusion (free of charge)
See this link for what version of Fusion.
Big Sur requires Fusion 12
STEP 3 - Obtain Windows 10
STEP 4 - Install Windows using Fusion
Step 5 - Install Windows Updates
After installing Windows be sure to run Windows Update.
Check out this video for a good description of the installation process.