Hello @worry,
here an image guide to install SAP NCo and UiPath BAPI connector successfully.
Install Microsoft Visual C++ 2010 x86 Redistributable first.
Then install SAP NCo.
In the next selection screen choose Install assemblies to GAC.
Now you can install UiPath SAP BAPI activity.
Old Version
I tried it with a Windows 10 installation, the SAP NCo 3.0.21 and UiPath 2019.3.0. All works well and as expected.
New Version
I tried it with a Windows 11 installation, the SAP NCo 3.0.24 and UiPath 2022.4.0. All works well and as expected.
Best regards
Stefan