For me it works again.
repeat renegadelink´s Step´s
Step 1: close Steam.
Step 2:Delete your steamswtor.vbs data.
Step 4:Create a new steamswtor.vbs with the code from renegadelink
Step 5:Put the .vbs data in the launcher folder.
Step 6:Open Steam as Admin
Step 7:Add SWTOR to Steam
Step 8:repeat Step 2 from renegadelink
Step 9:add SWTOR to your favourite list (rightklick on SWTOR and add .......to favourites or something)^^
Step 10:Go to your game collection and play SWTOR with the Steam Overlay