I am getting a message on my account on three of my four devices. The message says "please install the client application on your device". I cannot find nor understand this instruction.
Could you provide a screenshot in order to better understand where this message could come from?
It could also one of the following :
Somebody suggested i send a screenshot of the error but i do not know hown i do this.
Depending on the device you see the error on, you should be able to take screen shots with various tools.
For example the snipping tool.
Once you have the image (make sure to edit out personal information), use the insert/edit image option as shown below to add it to your post