10.5 Update issue old projects with Multi Timbral Outputs do not work

Ever since the update. which I love, I can not open some of my Multi Timbral Instruments such as EastWest Play Engine, Omnisphere etc.

It says to contact the 3rd party software makers. The problem is that I have worked so hard on these project prior to the update.

I can not replace the vst or all the settings and instruments will be lost.

FYI, If I open a new instance of these plugins, they will work fine... however, this is about my past projects before the update... i am unable to restore the original sounds or settings without opening a brand new instrument with default settings.