If the date resets to an old date (e.g., 2010) every time you unplug the PC or reboot:

: Some older versions or specific loaders require your system date to be set to a specific year in the past to bypass expired trial periods or license checks. If you recently updated your Windows time and WinOLS stopped working, you may need to manually set the year back (e.g., to 2013 or 2014) depending on your specific installation instructions.

Many checksum modules have internal validation dates.