Locate the Pathway within Find Learning (see find content in Find Learning if you're unsure how to do this) and go into its administration area.
Click on the Users tab on the left-hand side.
Click on the Any Status dropdown menu and change to Not Attempted or Incomplete.
Tick the box at the top of the Names list to select everyone.
Click on the Actions dropdown and choose Publish Changes.
A popup window will display the following message. Please through it and when you are happy, tick the box. 
Click on Continue.
This may take several minutes to complete.
Users that had a status Not Attempted or Incomplete will now be able to see the new version of the Pathway.