You can click Tools/Custom Options in PPT, then click command items in the custom window, click Insert on the left, find the formula editor on the right, drag it to a certain position in the tool button bar or menu, and then close the custom window. Click the formula editor button just dragged out, and a window will appear, prompting whether to install the formula editor, and then prompting to insert the Office CD. After installation, you can use the Formula Editor.

You can also run the installation file of Office directly, then select Add or Delete function, expand the Office tool, set the formula editor to run all programs of this machine, and click Start Update. After the update, you can use the formula editor.