Flash needs to be reinstalled on my mac each time

"I need to reinstall it everytime I need to open the program"

Flash Player is a  browser plugin and only works in the browser.  It's not a program you open by itself.  What exactly are you attemptingto do?

You don’t know where the Flash Player installer has been downloaded.

By default, the files are downloaded and saved to the Downloads folder unless the "save to" location is changed manually.

1. After downloading Flash Player, close all browsers.
2. Locate the Flash Player install file. Unless you have specified otherwise, the file is saved in your Downloads folder.
3. Double-click the installer file to begin the Flash Player installation.

Choose Window > Downloads or press Option+Command+L. Control-click the downloaded file and choose Show in Finder.

Thanks

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