To make browsing seamless and faster, Internet browsers (Chrome, IE, Safari, Firefox etc) take a snapshot of the webpage. When you visit the page again, the browser brings up a snapshot of the page and looks for changes, if any, requests them from the servers. While this method is efficient to save loading time and bandwidth for static pages, often times it causes issues with pages that need a lot of code to run, as the browser loads up stale code from the snapshot. Sometimes we need to manually force the browser to 'request' the latest version of the software, also known as a hard refresh.
Below are some instructions to perform a hard refresh on your browser to get the latest version of the software.
Chrome :
Windows/Linux :
Hold down Ctrl and click the Reload button 
Or
Hold down Ctrl and press F5.
Mac :
Hold ⇧ Shift and click the Reload button.
Or
Hold down ⌘ Cmd and ⇧ Shift key and then press R.
Firefox :
Windows/Linux :
Hold the Ctrl key and press the F5 key.
Or
Hold down Ctrl and ⇧ Shift and then press R.
Mac :
Hold down the ⇧ Shift and click the Reload button.
Or
Hold down ⌘ Cmd and ⇧ Shift and then press R.
Internet Explorer:
Hold the Ctrl key and press the F5 key.
Or
Hold the Ctrl key and click the Refresh button.