After ensuring that the appropriate version of the JRE is installed, the current version of Specvis can be found in the latest_build folder. You can find there two main directories, i.e. Specvis IntelliJ Project and Specvis Executable Pack.
The first one contains complete source code of the latest Specvis release which can be imported to the IntelliJ IDEA. The second one contains Specvis application with its related files.
From the other hand, if you are interested in older versions of Specvis and their source code, you can find them in the old_builds folder.
Everything "around" the latest_build and the old_builds folders is a working ground for a new future realease of Specvis. So don't be surprised if content of e.g. the src folder will change few times a week etc.
After you downloaded and unpacked the Specvis Executable Pack/Specvis.zip file, you can just double click on the Specvis.jar. You can also run Specvis from the terminal by typing java -jar Specvis.jar.
If you have a problem with the application, please first make sure that you are familiar with Tutorials and Documentation, and if you still need help, please go to the Issues section. While you are there try to look for the solution to your problem in existing issues. If you can't find solution, than create a new issue keeping in mind - the more accurately the problem is described the greater is chance for fast answer to it.
The source code and the application itself are released under the terms of GNU General Public License in version 3 as published by the Free Software Foundation. Software covered by this license is and will be free and open-source. In general, this license ensures, that everyone can use the software and modify it, however, each new release is also covered by the same license, so the freedom and capacity of the software remains preserved. This policy refers to the software as whole but also to each individual source code file.