The premise is that MathType has been downloaded
1. Open word------file------option---trust center---trust center setting---trusted location---select the bottom path and double click--- Copy that path -
2. Paste the path on the c drive - keep the file open
3. Right-click MathType---open the file location-----MathPage---64----copy the MathPage.wll file
4. Paste it into the opened file in 2. That is, in the file opened by the word path
5. Open Office Support---64-----Copy MathType Commands 2016.dotm in the MathType file
6. Copy this file to the file opened in 2. That is, in the file opened by the word path. It is the same file as 4
7. Open word again and you can see MathType
