Sound Arte Nuovo Silenth Goldmine For SYLENTH1 FXB-DISCOVER

make a new folder called sylenth1 x64 or anything you like
then copy the sylenth1x64.dll and key into it
and drop this folder into your plugin folder,

then go to ( studio one ) settings tab its next to help on the top row.
open options last tab on the list, this will open a new tab box,

there you will see ( chouse locations ) and on the end of that list there is ( vst plug-ins )
press it and there you can set your plugins folder.

frist see if your vst plugin folder is on the list and add the sylenth1 x64 folder you made to the list as well,
then tick the box, scan at start up,its just over the black-list tab,
you can also try rescan black-listed plugins and press Apply and ok,
studio one should now run a plugin scan after that
if sylenth dont show up at frist restart studio one and let it scan again,
you will also have to add all your banks to the new sylenth folder you just made,