As normal Majestic have pushed out the update to their distributors, so you should approach whomever you purchased your Majestic Q400 from to obtain this update.

QuoteThe Majestic Software Dash 8-Q400 Version 1.009 PILOT edition patch has been released, and is available for download from all of the vendors. Some of following issues that have been addressed in this patch are:
+ DME/VOR incorrect readings under certain conditions are fixed
+ Electrical system switching for abnormal operation is improved
+ Glideslope problems on certain runways are fixed
+ EGPWS elevation coloring is corrected
+ Numerous FMS LNAV and VNAV modifications are introduced in order to for FMS to better fly the approaches
+ Control Panel Weight & Balance page saving and loading of the parameters to the ini file is fixed
The complete list of changes can be found in the patch readme document, available under Majestic Software support->User Area

Cheers Chris, I've just seen that you can also get the update from the user area (you need your order number etc) on majestics website.  BTW at the time of writing there no update available on Just Flight.