Close the program. Relaunch it and before loading any projects or files, go to OPTIONS | DISK tab and Clear Unused Cache Files.
You can install and/or register any number of times. Try this release. Or reinstall the one that you bought. Even without a valid license, newer versions can always be test driven.
For licensed users upgrades are free for up to six months from purchase date. After that, VP will continue to fully function but a fee will be required in order to register the newest. Retain your old install file and registration info.