MPC 2.8, installation of MiniGrand and Velvet not recognized

Hi guys,
i was using MPC beats for some times, and the MPK mini mk3.
with the keyboard controller, come 2 plugins, Velvet and Minigrand...

today, i did install the MPC software 2.8.1, that came with my new MPC Studio Black ,... everything was installed correctly, nothing special... but i cant access my plugins ! i looked for a dll, without success..

i will be surprised that they dont work with MPC full... neither that there is a different installer for it..
Someone can help here ? i did re-install the plugins, but nothing changed

notes: everything is activated on i-lok, i checked

i may have some ideas, but i need confirmation:
- is it because i keep installed BEATS ? can both cohabitate ?
- it is because i did not install 1.9x before installing the 2.8.1 ?
- it is because the plugins Velvet and Minigrand need to be desintalled and re-installed when upgrading ?

well, hope someone know about this or had the same situation..thx
i would love to keep going using those 2 plugins, they are great

What exactly is obstructing you from finding the dll?
You don't know where it is?

By default, installers put the dll in a vst folder directory named steinberg.