Reinstalling Downloaded TikTok App

TikTok is still banned in the United States.

The law provides for fining companies $5000 for each user that they illegally help to access TikTok. There were about 170 million TikTok users in the United States. Do not expect Apple and Google to volunteer to burn $850 billion USD in fines just so that you can re-download the TikTok app before it is legal to do so.

About availability of TikTok and ByteDance Ltd. apps in the United States - Apple Support

I need to reinstall TikTok app

If it is not in the App Store then it is not back yet.

You cannot if you are in the US, and no one here knows if you ever will be able to do so.

You can access TikTok via a web browser.

You CANNOT from the US App Store.

If TikTok is so important to you, access it via a web browser.

IMPORTANT UPDATE:

The TikTok app has returned to the App Store.

Good luck! 👋🏼😉