For those wishing to update 1.74 has been added to the customer service site and can be found here at the bottom of the list.
I will be doing upgrades on Thursday and Friday at York, times to be determined if you'd rather wait.
These are the changes from 1.72
The Cab2 changes made from v1.72 were as follows:
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• Fix issues with Train and Route builders
• Additional optimizations for Base3 compatibility