It's first Æsir client release ! Yay !
Client uses login and password from command line. Get look at start.bat script.
There's a settings file named aesir.json, it provides server, lang and grfs settings. Server can be passed not only as ip, but there's also a support for domain name. Currently it provides en and ru languages. You can also specify multiple grfs, the order is as it will search in them, so put rdata.grf before data.grf.
Put your grf files in the folder where you'll extract 7z archive.
It uses PACKETVER 20110225, also you have to comment out line 1835 from file src/map/clif_packetdb.h, it will become something like this(this bug will be fixed soon in the æsir):
You can download it there: https://cloud.acomirei.ru/s/khm08qmHJSVLEUy
Get a fun !