Major revisions do not show up when you hit the updates tab. You need to go back to where you first logged on to load PI the first time you did so (hopefully you kept the email which gave the link). If you do so, you will get to the page with the latest versions of the program. Just click on the version for your system (Windows, OSX or Linux) and follow the steps to update your system to the newest version. You will need to do that with all major updates.
Btw, latest version is 1190 so you are quite a few behind in updates, though you only need to update using the 1190 version to bring you fully up to date.
Best,
Jim