There are two primary applications that closely match your search for "VPN ver build 366" or "Paper VPN." Based on recent data from early 2026, here is where you can find them:

For support or technical papers, you can reach them at support@papervpn.io . 2. Cool VPN Pro (Build 1.0.366)

When downloading APK files from third-party sites rather than the Play Store, always ensure you are using a reputable mirror like APKMirror or Uptodown to minimize security risks. Paper VPN - Apps on Google Play