Since "Dual-Audio" versions are often found on fan-run blogs or archival sites, prioritize safety and quality:
Go to and select "Track 2" or the specific language you prefer. 10-30 P.M. Summer (1966) Dual-Audio
High-quality transfers have been released by distributors like Kino Lorber or the BFI , which often include multiple audio tracks or subtitles. Since "Dual-Audio" versions are often found on fan-run
The Internet Archive often hosts public domain or rare films where you can check for different audio streams. 10-30 P.M. Summer (1966) Dual-Audio