What you need to do is install from the latest version in the repo, which is currently hosted in GitHib. It supports XE7. Link to this repo: https://github.com/project-jedi/jvcl
When you get there, follow the instructions. Step 1 - Install JCL, which can also be found on GitHub: https://github.com/project-jedi/jcl
In fact, as a rule, you should install open source projects. Installation programs require time and effort for project developers. Therefore, you will often find that these installers are a bit outdated. So, as a rule, grab the latest version directly from the repo.
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