How do I get Windows 10 installed on my macbook pro (late 2008)

How to install Windows without using the BootCamp Assistant.

1. Download and copy the Boot Camp Support Software to a flash drive. You will need this later.

2. You need to create a "MS-DOS (FAT)" formatted partition.

   One way would be during a clean install. Use the Disk Utility to create a two partitions. The first would be "Mac OS Extended (Journaled)" for OS X and the second would be "MS-DOS (FAT)" formatted for Windows. Install OS X to the first partition. I would avoid using Core Storage.

   The second way would be to create a single "Mac OS Extended (Journaled)" partition and install OS X. Again, avoid using Core Storage. Once installed, you should be able to use the Disk Utility to shrink this partition and add a "MS-DOS (FAT)" formatted partition for Windows.

3. Bless the Windows partition. Using the Disk Utility application, highlight the "MS-DOS (FAT)" formatted partition and click the Info button. Note the Disk Identifier. It usually is disk0s4. To install Windows, the last digit can not be greater than 4. In a Terminal application window, enter the following command.

   sudo bless --device /dev/disk0s4 --setBoot --legacy
   

   Here is assumed disk0s4 is the correct Disk Identifier.

4. Set the active MBR partition. From a Terminal application window enter the following.

   sudo fdisk -e /dev/disk0
   flag 4
   quit
   yes
   

   Here 4 was used because it was the last digit of the Disk Identifier. Below is an example of me entering the above commands.

   Steelhead:~ davidanderson$ sudo fdisk -e /dev/disk0
   Password:
   fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory
   Enter 'help' for information
   fdisk: 1> flag 4
   Partition 4 marked active.
   fdisk:*1> quit
   Writing current MBR to disk.
   Device could not be accessed exclusively.
   A reboot will be needed for changes to take effect. OK? [n] yes
   Steelhead:~ davidanderson$ 
   

5. Install Windows. Insert the Windows DVD and restart the computer. Hold down either Option key during restart. Choose the DVD when the icons appear. If you have more than one DVD icon, there may be a problem with the DVD. In this case, see the note below.

6. After the installation of Windows is complete, insert the flash drive and install the Boot Camp Support Software.

This was done from my memory. If you have a problem, let me know.

Note: More Than One DVD Icon

When trying to boot to the Window installation, DVD you may get two DVD icons to choose from. They are usually labeled "Windows" and "EFI Boot". The correct choice is "Windows". This may lead to the following message being displayed.

       1.

       2.
Select CD-ROM Boot Type :

I found this to be true using a DVD burned from the "Windows10_InsiderPreview_x64_EN-US_10074.iso". The message has also occurred using certain Windows 7, 8 and 8.1 installation DVD's. The problem is the DVD and not with the steps given in this answer. The solution is to remove the "EFI Boot" method from the DVD or iso image. The procedure is given at “Select CD-ROM Boot Type:” error during Windows install.

Why so complicated?

Just start Windows 8.1 and then update via web or when notified for the free copy download, to Windows 10.

Forget and ignore the Boot Camp compatibility.

I have updated a MacBook Pro, Late 2008 or maybe Early 2009, without any problems from Windows 8.1 to 10.

By the way I also updated my Mac Pro, Early 2008, to Windows 10.

This machine was not even meant to be compatible for Windows 8. I simply ignored Boot Camp (installed version 3) and started updates as per the procedure above.

There are only a few keyboard keys which are disabled like brightness and loudness adjustments as well as the eject key, but this can be easily controlled from other menu items.