# How to install
Installing a NWA app on your NumWorks calculator takes less than a minute. First, you download a nwa app on your computer, for example from our apps page. Then you install it on your calculator.
# General case
Usually you just need a nwa file. Here’s how to make it work:
- Download a .nwa file on your computer
- Go to NumWorks’s installer (opens new window) from your computer. Note: You’ll need to use a Chromium-based browser (e.g. Chrome).
- Click the “Connect” button
- A form should appear : use the file you downloaded in step 1.
- Press the “Install” button that just appeared.
# Apps that needs some external data
Some apps will need some external data to work. For example, Playa will need a video file to work. In this case, the steps are a little bit more complicated.
- Download the .nwa file, for example playa.nwa
- Download the additional extra file that’s needed, for example video.bin
- Head to NumWorks’ app installer (opens new window)
- Select the .nwa app. The installer will tell you that the app needs an external file.
- Use the second file as an external file.
- Press install!
# Apps that are too large
If you want to install an app that is over 2.5 MB you will need to use our memory extender.
# What if it doesn’t work ?
If the upload doesn’t work, here are some things worth trying:
- Make sure you’re using the latest version of your Chromium-based browser that support WebUSB
- Close all your browser tabs but one
- Try another USB cable
- Reset your calculator by using a pencil to press the reset button on the back