If someone needs an SP4 pack for 3ds max 2016 (the best version of 3ds max, according to other users) I have reuploaded it to MediaFire:
https://www.mediafire.com/file/okd1n5a6yfrbade/3dsMax2016_SP4.msp/file
Since autodesk has deleted all previouse versions from their websites, someone has reuploaded them, including updates and services packs, on Baidu: https://www.iiicg.com/archives/3506
Also here's an instruction how to download from Baidu, since they require you to login from now on: https://help.wwkejishe.top/baidu/baidu-wangpan-download