Just download a different browser, for example, the UC mini browser. It can cancel any downloads and it is also 10 times faster than your phone's default browser. It can be found in the Play Store.
Look up your problem online, and be as specific as you can. Check official websites for whatever isn't working (i.e. the Microsoft website for Windows problems, the Adobe website for...
Try updating the app again through the Google Play Store. If you still get error messages, try rebooting your device or modem, and try switching your WiFi off then back...