Error: Discord cannot find Update.

Discord can have problems with the process of install and uninstall.
The error is shown in the next image:

This error can appear when you want to uninstall discord to solve errors like Discord Javascript Error [Fatal Error].
To fix that error use this operation:

1. try to close all Discord process tasks using Task Manager, you can use the Ctrl+Shift+Esc button on the keyboard;
2. re-install the Discord application;

After that, working all well.