Detect an Application Is Installed or Not

How to check if an application is installed (For any user) while and make it an upgrade, instead of install?

Check both registry 64/32 for installed applications. Look for your product GUID under those keys. If it's there, it's installed.

This works for MSI installed stuff.

32 Bit:
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall]

64Bit:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall]

Detect an application is installed or not?

From Android How-to's

If you ever need to know if a particular app is installed on the user's device, you can use the PackageManager. From a Context class (e.g. an Activity or a Service) you can call getPackageManager(). This gives you a variety of methods, one of which is getPackageInfo(). Below is a method you might use. You might call it like this:

isAppInstalled("com.simexusa.campusmaps_full");

private boolean isAppInstalled(String packageName) {
    PackageManager pm = getPackageManager();
    boolean installed = false;
    try {
       pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
       installed = true;
    } catch (PackageManager.NameNotFoundException e) {
       installed = false;
    }
    return installed;
}

Check if application is installed - Android

Try this:

private boolean isPackageInstalled(String packageName, PackageManager packageManager) {
    try {
        packageManager.getPackageInfo(packageName, 0);
        return true;
    } catch (PackageManager.NameNotFoundException e) {
        return false;
    }
}

It attempts to fetch information about the package whose name you passed in. Failing that, if a NameNotFoundException was thrown, it means that no package with that name is installed, so we return false.

Note that we pass in a PackageManager instead of a Context, so that the method is slightly more flexibly usable and doesn't violate the law of Demeter. You can use the method without access to a Context instance, as long as you have a PackageManager instance.

Use it like this:

public void someMethod() {
    // ...
    
    PackageManager pm = context.getPackageManager();
    boolean isInstalled = isPackageInstalled("com.somepackage.name", pm);
    
    // ...
}

Note: From Android 11 (API 30), you might need to declare <queries> in your manifest, depending on what package you're looking for. Check out the docs for more info.

Detect is application installed on OS X before using Appium

Finally I found an answer to the question. If you want to check if an application exists -> run the next line in the Terminal:

mdfind -name {application_name}.app

Detect from browser if specific application is installed

If you want to detect with javascript inside the browser, you can probably use the collection "navigator.plugins". It works with Firefox, Opera and Chrome but unfortunately not with IE.

Update:
In FF, Opera and Chrome you can test it easily like this:

if (navigator.plugins["Adobe Acrobat"]) {
// do some stuff if it is installed
} else {
// do some other stuff if its not installed
}

Update #2:
If it is an ActiveX object in IE you can test if it exists by using something like this:

function getActiveXObject(name){
        try{
            return new ActiveXObject(name);
        }
        catch(err){
            return undefined;
        }
};

Another approach for IE is something similar to what JohnFx suggested (I found it here and have not tested it):

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Internet
Settings\User Agent\Post Platform

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