We have reports of R17 install showing as corrupted on Yosemite, we believe this is because of an incompatibility of the latest Apple compiler and code signing. The work around is to temporally disable Gatekeeper, install dBpoweramp then re-enable Gatekeeper.

Disabling Gatekeeper
From the Apple menu, open the "System Preferences" application.
Click on Security & Privacy > General tab.
If the lock in the left-hand corner is locked, click on it, then enter your Mac's username and password. This may not be required.
Click "Anywhere" under "Allow applications downloaded from:".
If you followed Step 3, please click the lock in the left-hand corner to return it to its locked state.