Application exits just after start

On Windows 10 (but not only), if the registry cannot be accessed for writing, vsTASKER will exit and this is a normal (license protection) behavior.
Make sure to run vsTASKER GUI in Administrative mode.

Method 1: Right click the vsTASKER icon on the Desktop and choose “Run as Administrator”
Method 2: Right click the vsTASKER icon, then Properties::Advanced… and check the option box “Run as Administrator”