helloshhh It's fine to "download" the game to the location where it's already installed. The EA App may not even download the data; it may simply verify the files and finish the install process. Or it might replace some or all files.
As for the reason this happened, it could be that your antivirus quarantined part of the game, making the App think it's not installed anymore. In that case, you would need to reinstall it to replace the missing file(s). This could also have other causes, but if it doesn't happen again, I'd ignore it.
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