If you don't know what is flex and how to download it visit this post.
Open the flex tool ".exe" file where you have downloaded.
Then follow the steps:
step -1: click yes
step -2:click next
step-3: Agree with the licence agreement
step-4: click next
step -5: Choose the file path to install
step-6: Click on next
step -7: Choose the shortcut path. My suggestion is not to change.step-8: Click next and install.
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