: Beta keys are not permanent . Jotego occasionally issues new keys for newer cores, meaning an old jtbeta.zip might work for older betas but fail for the latest releases.
if:
The Internet Archive is a legitimate repository for abandonware and historical software. Search for "Jtbeta" on archive.org . If the file exists there, it has likely been scanned and verified by the community. Never trust a random Google Drive link.