Taurine 1.1.7 is a modern alternative that supports on iOS 14.0 up to 14.8.1.
A Mac or Linux computer (Windows users can use tools like Odysseyn1x). Process: Download the latest version of Checkra1n on your computer. Jailbreak iOS 14.8.1 / 14,8
A computer to install the AltStore sideloading tool. Process: Taurine 1