When I try and install the Digital Soul 100 pack after installing CC4 I get this message -

RM3D
https://marketplace.reallusion.com/character-creator/author/remark3dcz

Did you try through Smart Content Manager in the software? Under 'Purchases' it should show up to install. Make sure the view setting is on 'All' or 'Uninstalled'.

Digital Soul didn't show up as a pack to download till this morning when I launched IC8, I was thinking maybe Reallusions servers are overloaded with everyone trying to install software

On Yesterday I bought this pack, too. And after refreshing Smart Content I find this pack for download immediately and without any problems.
Try your search for "New purchased" or Sort by...

(Anyway I can confirm that the Original "manual" download do not work, says that do not see IC8)




RM3D
https://marketplace.reallusion.com/character-creator/author/remark3dcz

Digital soul can't be applied on the time line while the characters would be talking?
One seems to delete the other becouse both accupies the same track. Is there a system bug or mistake of mine?

I use Digital Soul clips with my talking characters without problems.

Your lip-synching would end up in the Viseme track, whereas the Digital Soul clips would end up in the Expressions track. 

The one exception would be if you create your lip-synching with facial mocap such as liveFACE, because then it would be recorded as an expression. 

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For Digital Soul there are some exceptions such as from "Talk" folder and a few others.
They would overlap with viseme track for mouth opening, which would mostly be noticeable when person pause the talk with AccuLips.

For those expressions you may "Sample Selected Parts", choose the following and delete those sampled keys.