[Info] Math 4.17 deletes opensymbol

[dagerm]

After updating to version 4.17 the Math characters were no longer available,
In Math equations the most common symbol was a black telephone.

I resolved this by downloading opensymbol.zip, from the internet (free), then extracting it, and renaming the file opens.ttf to opens___.ttf.
Note there are 3 underlines.

This is added to the files in the Windows Font file by opening the windows settings (gear in the START menu) > Select personalization.
Select Fonts in left column and drag the renamed font file onto the drag and drop box. All Done.