OK I did some detective work and I found this in the DM24 section of the forum. In short, HIT F8 on boot up and choose last option each time and it loads the driver according to the post below. I put a link to the original thread below at the bottom of this response and it looks like they even confirmed they got the old drivers working in Windows 8.1! It sounds like you will have to do the F8 procedure every time in order for the drivers to load. Maybe the additional instructions I provided at the bottom of response will work to make the drivers load permanently but I would try the F8 technique first before anything else. LET US KNOW IF IT WORKS!
Hi together!
After some struggle installing my IF FW-DM in my Dm 24 on a brand new Notebook with w 7 Pro 64 bit, i try to contributea little to that issue. First of all I spent a lot of hours too, using the wrong firewire-cable. The reduction from 6 pins to 4 with removeable plugs did not work. All efforts to change the IEE 1394 divice drive to "alt" or "legacy" did not solve the problem. with a new cable the device manager showed the IF FW-DM i an new category of hardware but told me, that the driver could not be installed due to the missing digital signation. The solution was to keep F8 pressed while starting windows. The following screen enabels to choose "omit obligatory driver signation" or something like that (my version is in German) it's the last line to choose. Then I continued booting as usual. succes. Any time, I want to use the IF FW-DM i boot with depressed F8 and I had no problems ever since.
Hope, you will be successfull too
Organist
Here's the original thread.
http://www.tascamforums.com/threads/dm24-and-windows-7-help.71/page-3
Here are instructions I found in the old Tascamforums.co site to get unsigned drivers to load permanently using freeware:
RUNNING LOADED UNSIGNED DRIVERS
I found a neat program that will allow the unsigned drivers to work. Basically its a method that allows testers to test drivers without going thru the dramas of getting a signature from M$. The program is found here:
http://www.ngohq.com/?page=dseo
The load instructions are simple. As usual TURN OFF UAC (User Access Control).
Here's the instructions along with a video on how to do that in Windows 7:
http://windows.microsoft.com/en-us/windows/turn-user-account-control-on-off#1TC=windows-7
1. Run dseo13b.exe program
2. click "enable test mode". This allows 64 bit Windows 7 to be used for testing drivers
3. I rebooted to be safe, and you will see a faint test mode print in the corner
4. Now open Device Manager and find the location of the unsigned drivers that wont work, by expanding Properties and Driver Details. Your looking for something like C:\Windows\System32\drivers\xxxxxxx.sys
4. Run dseo13b.exe program again
5. This time select "sign a system file" and put in the location of the file you found in Device Manager
6. Repeat for all files in question then close. You have now assigned a signature to those files
7. Reboot
