Or just install Free Office from SoftMaker - it's what I used from lockdown until retirment - much better workflow and layout than MS Word (any version!):
I bought a 5 machine licence for just over £23 for the 2018 version in 2018 and upgraded for £55 for SoftMaker Office Pro 2021. You can install on 5 machines fro the pro - which can include Windows, Mac or Linux. The Windows version has a fully functioning MathType add-in - cheaper than paying an annual licence for MathType at £69+ per year per machine!