This are the latest installers I could find for Sylenth 1 (x86 is v184.108.40.206, x64 is v220.127.116.11).
There are 20 x86 skins and 1 x64 skin. The two Mopho skins have been manually updated to v18.104.22.168 by yours truly (I also fixed the up/down arrow graphical error the originals had) via resedit method. There are also 463 soundbanks–all in .fxb format (also manually compiled by yours truly). To my knowledge there are no dupes in there, but I may have missed one or two.