Apple acquired Texture last year to serve as the foundation of Apple News+ and later announced that Texture would cease working after May 28. On cue, the app no longer functions as of today and points users towards Apple News+.
Unfortunately, while Apple's notice in the Texture app says "don't worry, you can continue to read your favorite magazines" on Apple News+, the service is only available on the iPhone, iPad, iPod touch, and Mac. Texture supported multiple platforms, including iOS, macOS, Android, and previously Windows.
Apple News+ costs $9.99 per month in the United States, the same price as Texture charged, and $12.99 per month in Canada.