I have a later version (3.63 something)of it (from here too) but I dont know how to update it to 3.71. Do you know how?
Just for extra safety; if you have an active character you wish to continue playing with, first locate the save file folder and make a backup! Then the updating should be as simple as just downloading the new version and installing it - the exact details of the process might vary depending on your operating system, so feel free to post questions if it doesn't work just like that.