You can download the new version from the download page; or, if you would like to update your existing copy of Mojito, follow the straight forward upgrade steps, as usual. But,there is one additional step. You must also update a script.
Here are the steps:
1. First, update your copy of Mojito to 1.1.3 by following the upgrade steps.
2. Then, go back into the script editor (Menu: Tools > Script editor ...)
3. Open the Functions.gs script by clicking it's tab on the left.
4. Replace the entire contents of that file with the contents of this one: Functions.gs_1.1.3
5. Save the file (Menu: File > Save)
6. Close the script editor window, then got back to the Mojito spreadsheet and select "Check for Mojito Updates" from the Mojito menu. This should complete the upgrade to 1.1.3.