You uninstalled a core compontent, which is why you have these issues now and it seems like you forgot to make a backup (?). I think your fastest option is to upgrade to DNN 09.06.01 as it should install the missing DDR menu too.
Or else the DDR installer is part of the upgrade package of DNN. DNN_Platform_x.x.x_Upgrade.zip\Install\Module\DDRMenu_0x.0x.0x_Install.zip
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