I have a Macbook Air and I was notified that my flash player was out of date so I tried to install the newer version. Once the installer downloaded and I tried opening it, it would open up as a TextEdit file. Once I fixed that problem and was finally able to open it with the DiskImageMounter it would seem as it if started to load but then it suddenly goes blank. I tried everything on the troubleshooting page and it still does the same thing. I would really appreciate it if someone could help me fix this please!
Please delete all installer files you have previously downloaded II see at least two in the screenshot you have posted). Completely delete them form your system (empty the trash after deleting them). Then download the full, offline, installer posted at the bottom of the Installation problems | Flash Player | Mac page, in the 'Still having problems' section.