I don't know anything about Flash.
But why are you asking these questions? The software pops up and requests you install it to facilitate the download of the Adobe package (e.g., Photoshop). What is your worry? That Adobe is going to charge you money for an installer helper application that facilitates your trying their main products?
It's free. Please read this link : http://kb2.adobe.com/cps/898/cpsid_89889.html#main_How_do_I_download_a _trial_version_of_Creative_Suite_software_
Note: You should use IE to go to Adobe's site.