I've search the driver via google, but I couldn't find proper solution for you. Maybe you can try to visit (or maybe you already visited) this sites :
http://www.opendrivers.com/company/2794/pentax-free-driver-download.html
http://search.wareseeker.com/pentax-optio-m50-drivers/driver-os/
Hope this help. (^_^)
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