Just to cloud the issue a bit more, I have several Waves plugins and bundles that all expired at different times and I have yet to pay for WUP in at least 2 years. FWIW, I have recently bought several more singles at different times(gotta love those new sales prices
) and on at least 2 occasions, the install has failed. My solution both times was to (using latest Waves Central) uninstall all Waves and then re-install everything over again(including my fresh purchases). Both times, the installer announced to me that several plugins were being updated. Things that make you go "Hmmm"