No. IQTest360 is a web app, so there is nothing to install and nothing to update.
Open iqtest360.com in any modern browser — Chrome, Safari, Edge or Firefox — on your phone, tablet or computer, and sign in. Your progress is stored on your account, so you can start a test on your phone and pick it up later on your laptop.
Tip: to get an app-like icon on your phone, use your browser's Add to Home Screen option.