I can only tell you that I originally downloaded it from the website as per any other plugin.
Did the old windows classic & bounced the plugin, ie uninstall/reinstalled it from the website; now it works, however I can only play the tracks from the beginning, I cannot jump to the middle of a track for instance.
Here's my sys info, I doubt it'll help but you never know...
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Media Center Registered 10.0.161 -- D:\Program Files\J River\Media Center\
Microsoft Windows XP Workstation 5.1 Service Pack 1 (Build 2600)
AMD Athlon 1989 MHz MMX / Memory: Total - 523 MB, Free - 293 MB
Internet Explorer: 6.0.2800.1106 / ComCtl32.dll: 5.82 (xpsp1.020828-1920) / Shlwapi.dll: 6.00.2800.1514 (xpsp2.040109-1800) / Shell32.dll: 6.00.2800.1556 (xpsp2_gdr.040517-1325) / wnaspi32.dll: N/A
Ripping / Drive E: Mode:Normal Type:Auto Speed:Max
Drive G: RICOH CD-R/RW MP7163A Mode:ModeSecure Type:Auto Speed:Max
Digital playback: Yes / Use YADB: Yes / Get cover art: Yes / Calc replay gain: Yes / Copy volume: 32767
Eject after ripping: Yes / Play sound after ripping: No
Burning / Drive G: RICOH CD-R/RW MP7163A Addr: 1:1:0 Speed:16 MaxSpeed:16 BurnProof:Yes
Test mode: No / Eject after writing: Yes / Direct decoding: Yes / Write CD-Text: Yes
Use playback settings: Yes / Normalization: None