If you specifically need version 6.69, you can find it on the Old Versions page of the official REAPER website.
Cockos REAPER version 6.69 is a legacy update from October 2022 that introduced several "quality of life" improvements, particularly focusing on media import handling, plugin management, and multi-channel routing. cockos-reaper-6-69-patch
: The internal loopback device was updated to support up to 512 channels , allowing for complex audio routing between different project tabs. If you specifically need version 6