Does the computer you are installing to already have an installed OS on it?
Using either gparted in the Zorin Disk or using a partition Manager on the already installed OS on the computer, can you check whether there are currently Four Primary Partitions in use?
On any OS and any computer, you can only have a Maximum of Four Primary Partitions.
- Note: this can get confusing because developers created a workaround that allows them to create multiple Sub-partitions on One Primary partition. So if possible, a screenshot of the available or used partitions can help a great deal.





