Voxer still working to develope voxer app for computer. Voxer support said "We are currently working on a browser version of Voxer that will work on both PC or Mac computers that have Internet connection. Stay tuned!". Voxer for computer will comes in browser version. With voxer for computer, we will have a new computer application for communicate and share with our friends. So, be patient to stay tuned voxer walkie talkie app for personal computer and MAC.
source: Voxer Support