Microsoft is sending out an update to replace the SHA-1 hash to SHA-2 on March 12th… It will be mandatory to obtain any other updates.
You will have " until July 16, 2019 – to install the update. After that date, if you don’t have the requisite SHA-2 update installed, you’ll no longer be able to receive Windows security updates.
This is my opinion and only my opinion. If you are still using Win7(which I am…'cause of games), I would wait a few days after March 12th to get the update. As I have seen in past updates, MS’s luck with successful updates have been a bit off. Let someone else be the “lab rat”.
Be safe out there