HTTPS encryption protects the channel between your browser and the website you’re visiting, ensuring no one in the middle can tamper with the traffic or spy on what you’re doing. Without that encryption, someone with access to your router or ISP could intercept information sent to websites or inject malware into otherwise legitimate pages.
Starting from July 2018 the popular Chrome web browser will mark all HTTP sites as insecure that may cause "trust" issues for visitors even a website works correctly and does not violate user's privacy.
No any changes come to end-users. They all will be able to browse our websites and download links using previous names. Web browsers now automatically forward to HTTPS address.