The documentation for UIM 20.4 Install or Upgrade for an External CABI Server has:
DX UIM installer comes with uim_core_dashboards_pack version 2.50, which is unsupported for the cabi_external probe version 7.11. Follow these steps for the cabi_external probe to work:
Remove uim_core_dashboards_pack version 2.50.
Deploy uim_core_dashboards_pack version 2.45 HF2.
But there is no indication where it can be downloaded from.
Release : 20.4
Component : UIM - CABI
It is attached here for you to download