Step 1. Click the button below to download the YouTube Channel Downloader and follow the on-screen prompts to install it on your computer. After the installation process, run the program. This will be followed by a pop-up window that asks you to enter the registration code. If you have one, click on the “Register” option and enter your code along with your email. If you don’t have a code, you can either click on “Buy Now” to get a 20-digit registration code or close this window to choose the free trial option automatically.
If you want to download as videos itself, you can use other free tools like Free Youtube Download to download all videos with a single click. Please be careful while installing this tool as it optionally installs a browser toolbar and modifies search preferences. So please make sure you read and uncheck the optional checkboxes while installing to avoid surprises in your browser. 

Refresh the page and try again. Sometimes it is better when no other applications or software are running. For example, close Word, Excel, etc., and/or anything else that you are not using at the moment, and make sure you are not connected to Skype, Facebook or your email while doing the video download so your computer is not "busy" running heavy apps or software.
Using a strong password is a good way to protect your YouTube channel and Google account, but it's often not enough. The best way to secure your YouTube and Google account from hackers is to use Google's 2-Step Verification, which utilizes something you know (your password) and something you have (your phone). To login to your account, you'll need to enter both your password and a temporary code that Google sends you via text message or voice call on the phone. I highly recommend you enable 2-Step Verification for your Google account. Here's a step-by-step tutorial on how to enable and setup 2-Step Verification on your Google account and YouTube channel.
Totally free, 5KPlayer from DearMob is a media-playing utility that is a lot more than a downloader—but it's got a heck of a downloader integrated. Promising no viruses, ads, or plug-in requirements is a good start. It is, sadly, one of the few I tested that asks for a registration of your name and email—you have to do that to get the full download function across 300+ sites. You may still use it if you don't register; I didn't and was able to download 4K vids from YouTube.

Another workaround: Go back to the desktop and try AnyTrans ($39.99 for a single computer), a file manager for iOS devices that has an integrated downloader supporting 900 sites, including YouTube and Facebook. It'll transfer the videos to the iPhone for you over the USB cable. Even if you don't pay for AnyTrans, the download option remains and is free forever.
To protect your channel from COPPA, you can download all videos in the channel to your computer for backup or re-upload them to other platforms. Since online websites do not support batch downloading of videos, and most of them have suspicious and unsafe ads embedded, thus, it is better to use a safe and reliable tool like Jihosoft 4K Video Downloader.
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