I have reviewed the boards and their is an inconsistency on the order. Some say 2.5, then the 2.5 training mission update and lastly, 2.51. Others say install the training missions last and still others say the the training missions do not work. What is the order? running xp

Trackir4, Win10 Pro 64Bit, Intel(R) Core™ i5-2500 3.30 GHz 6M Intel Smart Cache LGA115 , GigaByte GA-Z68XP-UD4 Intel Z68 Chipset, DDR3 8GB Ram,AMD Radeon HD 6950 2GB GDDR5 16X PCIe Video Card, Main Monitor 1 on left 1920x1080 Monitor 2 on right 1280x1024