I dont know what codec versions these install, but it was the only legit copies I could grab from the original site on archive.org
You would think that the newer archive "20061216133954" would contain the assumably newer "aslcodec_setup_2.0.exe" installer but, idfk it seems aslcodec-setup.exe may be newer.
If you wanna try yourself: 
https://web.archive.org/web/20041120131655/http://www.alparysoft.com/products.php?id=8&item=35 = Main Page

https://web.archive.org/web/20061216133954if_/http://www.alparysoft.com:80/file.php?id=40 = aslcodec-setup.exe
https://web.archive.org/web/20041120002746/http://www.alparysoft.com/file.php?id=40 = aslcodec_setup_2.0.exe
https://web.archive.org/web/20050205072705if_/http://www.alparysoft.com:80/file.php?id=40 = aslcodec_setup_2.0b.957.exe

Other Shit:
https://web.archive.org/web/20041204150023if_/http://www.alparysoft.com:80/file.php?id=40
https://web.archive.org/web/20031209085035/http://www.alparysoft.com/prod/compression/lossless-video-codec.php
https://web.archive.org/web/20030608083904/http://www.alparysoft.com/prod/lossless-video-codec.phtml