Unable to uninstall / Upgrade LR 12.02

HI ,

I installed LR 12.02 in my Client's VDI Machine. To play around the new features of 12.5 Truclient, I tried to upgrade / Uninstall 12.02 ended up with Windows Installer Error. Due to spacing issue, I deleted the DVD extract of the LR 12.02 installation executable. How Can I solve this?. Can anybody help me out here?.

OS ; Windows 7 Enterprise Edition.