“Project Runway” arrived on television at the end of 2004, the same year that Mark Zuckerberg created a website called The Facebook at Harvard. In 2007, Apple released the first iPhone. Three years later, when “Project Runway” was in its seventh season, Instagram appeared in the App Store.

That tech-history lesson is to say: 2019 looks a whole lot different from 2004. So when Bravo reacquired the rights to “Project Runway” last year, the network wasted no time in recalibrating the show, which will have its premiere on Thursday .

The most significant of the changes is the cast.

Tim Gunn and Heidi Klum, whose faces have been synonymous with “Project Runway,” announced last September that they would not return to the show and that they are developing a new fashion series with Amazon, where viewers will be able to buy the styles they like through the website. Zac Posen, who replaced the designer Michael Kors, also departed. Nina Garcia, now the editor of Elle, is the only remaining member of the original cast.