First, what is your operating system?
Next, what do you mean by "b4" - this usually stands for "beta 4", and I am not aware that there is any current beta release available for Flash Player 11.3
Also, Flash Player has nothing to do with Acrobat; it is just "Adobe Flash Player". Adobe Acrobat is a completely different product.
Finally, from where are you downloading the Flash Player installer? Can you post a screenshot of that blue button you are seeing?
Moving this discussion to the Installing Flash Player forum.