The instructions below will walk you through how to continue an unfinished tool & update an updatable tool.
If you have not finished a tool, you can continue filling the tool by selecting tools -> and then selecting "unfinished" from the list of the tool you want to continue filling.
The updatable checklists you have completed will appear under this menu. By clicking on the "Updatable" menu, you will get a list of tools that you can update after filling.
When you click the row you can update that filled tool.
After finishing that you will find versions at document page.