hi rick, i just attempted to use the built-in updater and it failed after removing the previous version, just left the paint.net folder and my effects folder, but no .exe or .dll files. i'm using win7 64 bit home premium.
edit: the download zip won't install either, here's the report:
System.ComponentModel.Win32Exception (0x80004005): MsiOpenDatabaseW (110) at PaintDotNet.Setup.Msi.ThrowIfFailed(UInt32 retVal, String message) in D:\src\pdn\paintdotnet\src\SetupFrontEnd\Msi.cs:line 29
at PaintDotNet.Setup.Msi.SetMsiTargetPlatform(String msiPath, ProcessorArchitecture architecture) in D:\src\pdn\paintdotnet\src\SetupFrontEnd\Msi.cs:line 267
at PaintDotNet.Setup.InstallingPage.<DoInstallation>d__21.MoveNext() in D:\src\pdn\paintdotnet\src\SetupFrontEnd\InstallingPage.cs:line 1054
at PaintDotNet.Threading.Tasks.IterativeTask.IterativeTaskAnon.<OnExecute>d__0.MoveNext() in D:\src\pdn\paintdotnet\src\Core\Threading\Tasks\IterativeTask.cs:line 33
at PaintDotNet.Threading.Tasks.IterativeTask`1.<>c__DisplayClass1.<StepTask>b__0() in D:\src\pdn\paintdotnet\src\Core\Threading\Tasks\IterativeTask`1.cs:line 74