I uninstalled the previous version. I installed the new module. on 5.05.01 running .net 4. The uninstall and install reported success and no errors.
I installed the module on a test page and got an error  and I found this in the event log:
ModuleId: 603
ModuleDefId: 159
FriendlyName: Gallery
ModuleControlSource: DesktopModules/Gallery/Container.ascx
AssemblyVersion: 5.5.1
PortalID: 3
PortalName: Western Montana School for Guides
UserID: 1
UserName: host
ActiveTabID: 149
ActiveTabName: img rotator
RawURL: /Jobs/TestZone/imgrotator.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://guideschool.us/Jobs/TestZone/imgrotator.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; MS-RTC LM 8; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; FDM; .NET4.0C; .NET4.0E)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 8910ed7b-6d4f-4c9c-9fb2-4fd0b5ae0598
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Modules.Gallery.Container.GetStats
StackTrace:
Message: DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Modules.Gallery.Container.GetStats() at DotNetNuke.Modules.Gallery.Container.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace ---
Source:

Thanks for looking :)

you were correct in that i had the earlier version installed. I uninstalled and reinstalled the newer module and still have the same error.