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You may try 2.9.4 if you like.

www.linuxcnc.org/iso/linuxcnc_2.9.4-amd64.hybrid.iso

Your HDD probably has enough space to dual boot LinuxCNC 2.9.4 and 2.9.4.

Why? What's the point of having two of the same version?

Could it be that I am not using the correct version of LinuxCNC?

No, any version of LinuxCNC from 2.8 on will work with the 7I76E

Like I said you need to check


hm2_7i76e.0.7i76.0.0.spinout-minlim  
hm2_7i76e.0.7i76.0.0.spinout-maxlim   
hm2_7i76e.0.7i76.0.0.spinout-scalemax 
hm2_7i76e.0.7i76.0.0.spinena-invert  

 hm2_7i76e.0.7i76.0.0.spinout
hm2_7i76e.0.7i76.0.0.spinena

with halshow

In axis, you can run halshow with:

Machine --> Show Hal Configuration --> Watch

And also verify that you have +10V on the 7I76E SPINDLE+ pin
(TB4 pin 3) relative to SPINDLE- (TB4 pin 1)