Ive done some snooping on the website and found some torrent download links for older versions.

S2_6B
S2_6C
S2_6D
S2_6E
S2_6F
S2_6G
S2_6H
S2_6J
S3_6K
S3_6M
S3_6N
S3_6P
S3_6Q
S3_6R
S3_6T
S3_6U
S3_6V
S3_7A
S3_7B
S3_7C
S3_7D

This is all I found for now. There are also test patch urls but I dont know if its okay to post all those.

I'm sad that https://www.lfs-museum.tk/ died, best archive out there.

https://web.archive.org/web/20220401093259/https://lfs-museum.tk/

This URL format works too if you edit it with the desired version:

https://www.lfs.net/file_lfs.php?name=LFS_S2_6E_setup.exe

Unfortunately that only works from S2_6E onwards.