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Download the four rel-1.13.0-RC source code bundles (not "installer" files) and unzip/untar them into parallel directories:
https://github.com/vivo-project/Vitro-languages/releases/tag/rel-1.13.0-RC-12
https://github.com/vivo-project/VIVO-languages/releases/tag/rel-1.13.0-RC-12
https://github.com/vivo-project/Vitro/releases/tag/rel-1.13.0-RC-14
https://github.com/vivo-project/VIVO/releases/tag/rel-1.13.0-RC-14
Step 2: Build Vitro-languages and VIVO-languages
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