Get application version functions

alert(GetAppVersion());

function GetAppVersionName() {
	var appPath = app.filePath.fsName,
	tempArr = (File.fs == "Windows") ? appPath.split("\\") : appPath.split("/"),
	appName = tempArr[tempArr.length - 1].replace(/^Adobe InDesign\s/, "").replace(/\s\(32-bit\)/, "").replace(/\s+/, " ");
	return appName;
}


alert(GetAppVersionName());

function GetAppVersion() {
	var appVersion,
	appVersionNum = Number(String(app.version).split(".")[0]);
	
	switch (appVersionNum) {
		case 18:
			appVersion = "2023";
			break;
		case 17:
			appVersion = "2022";
			break;			
		case 16:
			appVersion = "2021";
			break;	
		case 15:
			appVersion = "2020";
			break;	
		case 14:
			appVersion = "CC 2019";
			break;
		case 13:
			appVersion = "CC 2018";
			break;
		case 12:
			appVersion = "CC 2017";
			break;
		case 11:
			appVersion = "CC 2015";
			break;
		case 10:
			appVersion = "CC 2014";
			break;			
		case 9:
			appVersion = "CC";
			break;		
		case 8:
			appVersion = "CS 6";
			break;
		case 7:
			if (app.version.match(/^7\.5/) != null) {
				appVersion = "CS 5.5";
			}
			else {
				appVersion = "CS 5";
			}
			break;
		case 6:
			appVersion = "CS 4";
			break;
		case 5:
			appVersion = "CS 3";
			break;
		case 4:
			appVersion = "CS 2";
			break;
		case 3:
			appVersion = "CS";
			break;			
		default:
		return null;
	}

	return appVersion;
}

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To get all installed versions of InDesign, use the following code:

var allInDesignVersionsInstalled = [];
for (var n=0; n < apps.length; n++) {
	if (apps[n].match(/^indesign/)) {
		allInDesignVersionsInstalled[allInDesignVersionsInstalled.length++] = apps[n];
	}
}
alert(allInDesignVersionsInstalled.join("\r")); 

See also:

How to get the version of an InDesign file

Versions of InDesign