during game play in QM all the aircraft choices lead to "corrupt files
This is a different issue! You need to delete your last.quick. (or minimum, press "reset" in QMB)
The fact that during install you get an error message means, some of your archives to install from are damaged. The install might launch but is damaged. You need a to be able to run the installers without error. Only then the download files are good. Useless to ignore this.
4.2 gives you a logfile after install that tells you what exactly is wrong. Get a set of "not curupted files". Download the damaged ones again.
PS: the files are damaged on your end by a faulty download (for whatever reason). The files up on mediafire are fine. So, getting them via PM does nothing for you. just download the files again, maybe use a different browser....
... and make sure to not let your browser just "overwrite" an existing downloaded damaged file. Delete it before you download it again. Your browser might try to be clever and think: Ah, it is already there" so it only fakes a new download, and offers you the same damaged file over and over.