NinjaTrader should always be installed by default into your Documents folder, but NinjaTrader cannot be installed into OneDrive. If your Documents folder is located in OneDrive, you will need to do one of the following:
1) Turn off OneDrive for the Documents folder or turn it off for the NinjaTrader folder in OneDrive.
2) Relocate the Documents folder, e.g., from C:\Users\Trader\OneDrive\Documents to C:\Users\Trader\Documents, C:\Documents, D:\Documents, etc.
How to Change the My Documents Folder Storage Location
When the properties of the My Documents folder (the desktop icon) are displayed and a group policy has not been established to redirect the folder, you can change the path to the My Documents folder and move the contents from the old location to the new location:
Right-click My Documents (on the desktop), and then click Properties.
In the Target box, type the new path to the My Documents folder, or click Move to browse to the folder and, if needed, create a new My Documents folder. If the path you type does not exist, you are prompted to confirm that you want to create a new folder.
Click Yes to move files from the old My Documents location to the new location, or click No if you do not want to move these files. Note that if you click No, the files in the old location are not deleted, but they are no longer visible from My Documents after the change.