Easy.
Using your phone Navigate to
http://m.vision5.com/pro/
Click the Windows Mobile link
Install the CAB file
After sMMS has install, Open sMMS.
It will be the demo version. wait out the nag screen, put in you # and pass, click save out to the main screen and click update.
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Former Windows Mobile enthusiast and developer, now a modder working on Android. I still have my PPC 6700 and HTC Touch, but I'm rocking a OnePlus 7 Pro