Thank you. I inadvertently downloaded the free version by mistake and installed it over my studio version. Now running Studio 17.2 and all is well again. I guess that means that Sony users will have to purchase the full version.
Resolve 18.2 Studio
iMac Pro (2017) OS12.5
3.2 GHz Intel Xeon W (10 Core) 64 GB 2666 MHz DDR4 Radeon Pro Vega 56 8GB