Rename the file com.javiersc.gradle.plugins.projects.version.catalog.gradle.plugin-0.1.0-rc.45-javadoc.jar to com.javiersc.gradle.plugins.projects.version.catalog.gradle.plugin-0.1.0-rc.45-javadoc.zip
Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder com.javiersc.gradle.plugins.projects.version.catalog.gradle.plugin-0.1.0-rc.45-javadoc
Double click index.html will open the index page on your default web browser.