I have removed .Net Framework feature from "Server Manager -> Remove Roles and features Wizard".
(This image is from a different server)
Later I noticed that this activity has affected many windows features (Server manager, IIS Manager, Turn on off windows features etc..).
After removed .Net Framework feature I was not able to find the Server Manager application.
I tried answer in this link and able to restore ServerManager.exe but once I try to load the server manager it's giving below error,

I may be able to resolve this if I can re enable .Net frame work feature. But not sure how to do that without using server manager(since I cannot open sever manager). Appreciate any solutions or suggestions regarding this.