Source for Aget 0.57

[sim642]

This benchmark suite contains Aget 0.57 according to a README:

sctbench/benchmarks/conc-bugs/aget-bug2/aget-devel/README

Line 1 in d59ab26

EnderUNIX Aget 0.57 README

However, the seemingly-official repository for Aget is https://github.com/EnderUNIX/Aget and only mentions v0.4.1.
Similarly, the last working archived version of its website says

Latest Stable Version: 0.4.1

So where is this version 0.57 from? Only other copies I've found (e.g. https://github.com/marchartung/DataRaceBenchmark) originate from SCTBench.