justneedhelp Hello,
May you please provide the details that are needed to resolving your issue, such as which operating system are you using, which browser, how much free space do you have on your hard drive, what type of cable you are using (is it the stock usb cable that came with your phone), and is it a desktop or laptop or a supported device from which you are attempting to install from?
"Error: You need to download a release first!"
This typically means that you either don't have enough free space or using an unsupported browser or doing it in incognito mode?
Have you carefully read through the https://grapheneos.org/install/web#prerequisites