I've got a new client install where all non-W8 Client PCs (IE8) connect and install the RSPrintClient plugin without issue. All W8/IE10 machines are experiencing issues.
When printing from the Report Viewer (http://server/reports) the reports the W8/IE10 boxes work nicely.
When the direct render URL is used: (http://server/ReportServer?/WinGAPReports/PRC_General&nRealkey=1&ReportSvr=atthomas-pc\sqlexpress&ReportDB=Richmond2013),
the report viewer renders correctly, but the RSPrintClient will not install correctly, UAC warnings appear (despite UAC settings to "never"), and IE10 hangs when attempting to install again.