For those of you using VC4 and wanting to convert your presets in VC5, Arturia has released a program to assist you.
“As we have modified in the V Collection 5 the sound engines of our software instruments the presets from the V Collection 4 were not compatible. This new preset converter allows you to open in the latest versions all the sounds you made in the past.
Download it, scan your presets in a click, select the ones you want to convert and you’re done!”
Get it here: https://www.arturia.com/v-collection/resources