If you cannot access the Google Play Store, manually install the app by downloading the apk file below.
Download Topo.apk
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Step 1 (of 5)
From the Home screen, swipe up or down from the center of the display to access the apps screen. Open Settings. -
Step 2 (of 5)
Navigate to Settings > Security and privacy. -
Step 3
Tap Install unknown apps. - Step 4
Find the browser you are using e.g. Chrome or Firefox. - Step 5
Download Topo.apk, then tap Open to open the app.