My first post here, hope I'm in the right place

I recently got hold of some of my old tracks that I thought were lost forever, and I'm having a bit of trouble with the VST's and Rewiring.
I mostly use Kontakt 5 and Reason Rewire and am pretty sure that's what I was using back then as well. All the VST's are installed correctly as far as I can tell, and when I open a new project they are all appearing, as well as my Reason Rewire. However, when I open one of my old files none of them are there.
I am using the same version of Cubase (Artist 8) and the same VST's but they just aren't appearing. I'm running Windows 10 64 bit.
I've attached 2 pictures. One of a new project which has all the VSTs, and an older project that hasn't.
Can anyone help me out? Do I need to somehow rescan for the VSTs on my older projects to tell them where they are?
Thank you!
James

