I have some questions about Microsoft Access 2016 Runtime

1) I don't know if it is updated automatically or how to update it manually.
2) When I create a PDF With Docmd.OutputTo it is closed the program, If I repeat the process the program works ok.
3) When I make updates in the program and then I put .accdr file in the customers computers (Access 2016 Runtime), Few minutes later the program crash (Database) and the message that appear is "Unrecognized database format" Error