Sum ppl have problem with Complete way b4 Win10. Most important is do crit rebuild 1.69 after install SoU & HotU. Then try add premium after all Bio campaign look to work right 4 u. Try toolkit too.
But still might have problem wid gfx depend on vcard/driver wut u have there so tell us all wut your rig look like so wen ppl who have same stuff on their box stop to read this they know better how to fix then just guessing.
Here some Win10 and Complete tech topic to read. They might tell something 4 u to do that is easy.
Running NWN in Windows 10 - Post Your Results / Issues Here
NWN Complete Freezed on Updating component registration
A problem with NWN complete
Cannot Install NWN Complete
Sry to make sound so complecated but very old game with old gfx that new hardware not always support. Ppl here can help but need sit in your seat to do best so give all u know of your box.