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BugZero found this defect 4448 days ago.
You need to install a standalone Veeam Report Viewer to view offline reports.
There are several options to install Veeam Report Viewer: Veeam ONE ISO file: You can start Veeam Report Viewer setup from the ISO file: VeeamONE_10.0.0.750.iso\Redistr\ReportViewer.msi. Veeam ONE Reporter UI: You can start Veeam Report Viewer setup either using the Veeam ONE Reporter UI: Workspace > Offline Reports > Select any report > Actions panel > Download Veeam Report Viewer. Veeam ONE Reporter URL: You can start Veeam Report Viewer setup either using the Reporter URL: http://ComputerName:1239/Viewer/VmReportViewerSetup.msi Veeam ONE Reporter installation directory: You can launch the installer from the installation directory (the default path is C:\Program Files\Veeam\Veeam ONE\Veeam ONE Reporter Web\Viewer).
Shall you have any questions, contact Veeam Technical Support