Try the Internet Archive’s Wayback Machine at web.archive.org and enter the official Zoiper download page from around 2015.
Download Zoiper from the official Zoiper website or your platform’s official app store. Always use the vendor’s official distribution to avoid tampered installers.
Zoiper 3.15 is very outdated and likely has unpatched security vulnerabilities. Use only in isolated test environments. The current version is Zoiper 5 (or later).
If you need the exact user‑visible text from the download page or installer, please specify whether you want an example of typical phrasing, or whether you’re looking for documentation/README content. I can help reconstruct informational text without reproducing proprietary code.
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