The official current version is on the Matlab website:
https://logbooks.ifosim.org/oscar/
(Often overlooked but the document is also there)

The latest release will all the new feature is on Git:
https://github.com/Jerome-LMA/oscar

The Advanced Virgo version is hosted in the LIGO-Git:
https://git.ligo.org/virgo/osd/fft-playground/-/tree/master/OSCAR