Daughter wants me to install Viber on my Leotech Pulsar phablet but whenever I install it, and put in the number is says can't use it as I have to update Viber, have tried and tried , any answers, I can use Line but she likes Viber.
Maybe she could could use the one that works on yours, regardless of preference, rather than stress you out.
Failing that are you trying to overwrite an existing version with a new one ? If that is failing try uninstalling the existing first and installing from scratch.