If you don’t have access to the internet, you’ll get the message saying that it's required.
Tips for mobile users: Learn how to clear the WhatsApp cache from your iPhone, Samsung, or any other Android phone with this easy step-by-step guide. If this doesn’t help, repeat the steps but only click on Clear Data instead of Clear Cache, and see if it works.
Updating Viber shouldn't be a problem if you have enough memory or are connected to the internet. You can also find more information on securely backing up your Viber data on a computer. Tip: before fixing Viber crashing issue, please backup your Viber data using mobitrans.