I receive massive errors when I used a mapped drive for the installation. After I copied the Notes Client install files local to the Citrix server, the installation went smooth.
(Ok, in my case it was just on a VMware workstation on harddisk D: and “net use Z: \.host\Shared folder\C$” Z:\LotusNotesClient85\Lotus Notes 8.5.msi but perhpas the hint helps)