The release is currently scheduled for mid-August.
PVR was developed mainly under OSX, and currently also builds on Linux. Windows support is under development, and any contributions are welcome.
Having problems building or using PVR? Please join the PVR email list at Google Groups (pvrbook@ googlegroups.com & https://groups.google.com/forum/#!forum/pvrbook). Issues with the code itself can be filed at https://github.com/pvrbook/pvr/issues.