EVInstall.nsf fails immediately with the following error:

No Enterprise Vault template (ev_mail9.ntf) is created on the selected Domino Mail Server and no forms (ev_forms9.nsf and ev_forms9_x.nsf) are created on the selected Domino Mail Server and EVDG.
The aforementioned issue has been observed after the installation of the IBM Feature Pack 10 (FP10) on top of IBM Domino 9.0.1, installing the IBM Feature Pack 10 on the IBM Notes running EVInstall.nsf does not fix this issue.
EVInstall.nsf uses the NSFDbGetMajMinVersion to get the Domino Mail Major version, in IBM Domino 9.0.1 FP10 the value returned is incorrect as documented in SPR KBRNAVLMA3 --> Fixed an issue where the version string returned was incorrect with the API NSFDbGetMajMinVersion after upgrading to Domino 9.0.1FP10
Install the latest Interim Fix (since IF1) on top of IBM Domino Server 9.0.1 FP10 (Domino Mail Server and Enterprise Vault Domino Gateway).
The IBM SPR KBRNAVLMA3 also affects IBM Notes 9.0.1 FP10, therefore the client used to run EVInstall.nsf must have the Interim Fix installed (since IF1).
After the installation of the aforementioned fix re-run the EVInstall.nsf to create Enterprise Vault templates and forms.