I am also facing this issue, I find and try many methods. but not work for me. Then I try a method which solves my error please follow
Open Chrome and type the following address in the address bar
chrome://components/
Now find entry find an entry named “Widevine Content Decryption Module”.
Click the button “Check for update” present underneath.
I hope this will fix your Widevine Content Decryption Module Update error issue