I tried downloading Adobe Flash Player version 18.104.22.168 but it gets stuck on the "installation will begin shortly..." screen and after 5 min it says " Application initialization error " . I am running Windows 10 (64-bit). I want to download Adobe Flash Player with Mozilla Firefox.
I'll need to get the online installer log files to troubleshoot the error. The log files, Adobe_ADM.log and Adobe_GDE.log are saved at C:\Users\<YourUserID>\AppData\Local\Temp\Adobe_ADMLogs. Upload both files to cloud.acrobat.com/send using the instructions How to share a document . Post the link to the uploaded files in your reply.
As an alternative, you can try using the offline installer posted at the bottom of the Installation problems | Flash Player | Windows 7 and earlier page in the 'Still having problems' section, however, please do provide the online installer log files so that we can troubleshoot the failure.