Installing Win 10

[vulgo]

It gave me the same message as before:
View attachment 268756

Press shift + F10 for a command prompt, then format the partition to NTFS

Edit: Looking more closely at the installer image you posted, can you not just "delete" the partition then install to the free space?

 

[vulgo]

wow, this is becoming the most complicated windows installation i have ever heard of...

Me personally, any partitioning of disks gets done with gparted/linux. Found it saves a lot of mac/windows fooling around.