[ RC3 was malformed as a result of some tooling failures ] The fourth (and hopefully final) RC for the 1.86.0 Beta release is now available. Available at: https://archives.boost.io/beta/1.86.0.beta1/source/ The SHA256 checksums are as follows: cad677f5b746bd83c68131766554b56ebf40eb7ba94823526b03820db9dbc049 boost_1_86_0_b1_rc4.7z 6c3b6b6b1760090ebd658b764c9006d9579df2a20763ede356e059fe52989277 boost_1_86_0_b1_rc4.tar.bz2 cc0e5c0fb54ea8762c2eb9fbfd185cb8ccbe1ad33c218883f9438dbe2f9a795b boost_1_86_0_b1_rc4.zip 82b59c0ca4d3b8bbf910ffdbbf535ef738fa1d648b8ba6f2608b516a58f89c55 boost_1_86_0_b1_rc4.tar.gz Changed libraries between RC2 and RC4: Boost.Process fixed some build issues on Windows As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. -- The Release Managers