Are you installing using B4ABridge, or from GooglePlay?
The app name may be different but you may have an app with the same package name.
Also, some device don't allow side loading as default.
Thanks for your answer
I am tryinng to install using these ways :
a)Debug from B4A. It connects with device but breaks debugging when try to install
b) Deploy from B4A, when it tries to install message is showed
c) I access the device, copy the file and try to install . The same
d)Download the file from email , its download OK and when try to install the same message
The curious thing , I bought the same device 2 months ago and it worked but it seem the new one have a new compilation. Same Android version.
Maybe I must actualice my SDK version ? Because I try to configure all options I found with not success