How do I add an older version of an indicator to my chart?

When you add an indicator to the chart, the most recent published version of the indicator is added. You can access an indicator's past versions only if it's written in Pine Script^® and open-source. All community scripts, and some built-in scripts, are written in Pine Script.

To use an older version of an indicator, first load the indicator onto the chart and check whether the "Source code" button (curly braces `{}` icon) is visible for the indicator. If the button is present, then you can access the source code, including older versions. Select the "Source code" button to open the indicator's script in the Pine Editor:

Next, open the Pine Editor's "Manage script" dropdown menu (the arrow next to the script name in the editor's menu bar) and select "Version history":

The "Version history" panel lists the script versions in chronological order, where the first version listed is the most recent published script. The panel also displays a side-by-side or inline preview of the scripts, which highlights the differences between two script versions.

By default, script versions are identified using the date and time that they were published. You can use the search bar to find a specific version by typing the corresponding date/time. Select your desired script version, then open its "More" menu and select the "Add version to chart" option: 

The older version of the indicator appears in a new pane on the chart, differentiated by an "Update available" symbol next to the indicator's name, which signifies that a newer version is available:

Note that the original indicator you added (the one that uses the latest script version) still remains on the chart, and its respective script version also remains open in the Pine Editor, as shown by the green source code icon next to its name.