Some players have reported being unable to Update the Launcher, when they try they get presented with a screen such as the following:

It's been found that there can be other applications (running) that are interfering with the Launcher, for exampleoverwolf has been clashes with the Evercore Heroes Launcher for several users.

Removing overwolf, or running CTRL+ALT+DEL, Task Manager and ensuring it's not running have resolved the issue.