Guys, I finally tried to reinstall manually as you said and during the installation I saw for the VST Plug-In that the "Entire feature will be unavailable" option was selected. I just change it to make VST Plug-In feature available and I have the dll's ! :D
Maybe my internet connection is not as bad as I thought ^^'
It was a stupid problem. How can I be so stupid >_< *shame*
I understand why you were so suspicious, you thought I wanted to use a cracked version or something else... I don't know.
I thank you guys for your patience and your help ! <3