Take this to the WSJT-X Support list (Ham-Apps).

The current version of JT-Alert is 2.*60*.0. As documented in the
Release Notes, it *REQUIRES* dot Net 6.x as Microsoft have stopped
support for dotNET 5.x.

Download/install the correct version of the dot NET 6.0 *DESKTOP*
runtime from the link at the top of the page at www.hamapps.com.

It's a bright RED Box that says "Important Notice JTAlert requires
the .NET 6 DESKTOP Runtime"

73,

... Joe, W4TV