Yes, you can indeed download them for free from GitHub, but without a premium license, you won’t be able to update them automatically. If you think you can update them manually whenever a new version is released, then yes, it won’t cost you anything. However, if you’re asking this question, I doubt you’ll succeed. The cost of a programmer’s work for this process is higher than the price of the licenses themselves, so in the end, it’s worth paying for a license. The advantage of offering a free download is to allow users to test the product before committing to a purchase.

Moreover, I believe the license should be paid for to support the development of the software if you decide to use it. Without funding, no one will continue updating the software, and over time, it will become obsolete. In that case, your investment in that website will be wasted money.