'Application Initialization Error' is an error returned by the online installer. To troubleshoot, I'll need to view the Adobe_ADM.log and Adobe_GDE.log files. They are saved at C:\Users\<YourUserID>\AppData\Local\Temp\.
AppData is a hidden directory. If you do not see the directory, see Show hidden files, folders, and filename extensions in Windows 10 and earlier for instructions to enable 'view hidden folders'.
Upload both files (Adobe_ADM.log and Adobe_GDE.log) to cloud.acrobat.com/send using the instructions at How to share a document and post the link to the uploaded files in your reply.
In the interim, you can use the offline installer, posted at the bottom of the Installation problems | Flash Player | Windows 7 and earlier page, in the 'Still having problems' section. But please do provide us with the 2 log files so that we can troubleshoot the error.
You don't specify which browser you are attempting to install Flash Player for, and I forgot to ask. If you're installing Flash Player for Chrome, Google does embed Flash Player in Chrome and you most likely only need to enable Flash in the browser see Use or fix Flash audio & video - Computer - Google Chrome Help for assistance.
If you're using Firefox, you may need to enable Flash Player in the browser after installing it. See Why do I have to click to activate plugins? | Firefox Help
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