Not sure where this properly belongs, but I see one or two similar questions in Mac & Linux Products
Thread moved from Community Support to Business > Endpoint Security > Mac & Linux Products for attention.
Looking at the supported products page for 5.9, VSEL isn't listed as a supported product.
Looking at the VSEL supported environments page, EPO 5.3 was the latest supported version:
ePolicy Orchestrator (ePO) support
VSEL Version ePO Version VSEL 2.0.x ePO 5.3.x, 5.1.x VSEL 1.9.x ePO 5.3.x, 5.1.x
Note: Removed from Moderation Queue.
Between these 2 posts the Extension which supports ePO5.9 was released.
The SNS went out around 27th July :-
McAfee VirusScan Enterprise For Linux 2.0.3 HF1196448 is now available. This release includes new features/enhancements.
* Support for McAfee ePO 5.9.x. Using this extension, you can manage McAfee VirusScan Enterprise for Linux 1.9.2 and 2.0.3 from McAfee ePO 5.9.x.
To download HF1196448 (McAfeeVSEForLinux-22.214.171.124216-HF1196448.zip), go to the Product Downloads site at: http://www.mcafee.com/us/downloads/downloads.aspx.
For a full list of changes, see the Release Notes in [PD27175]: https://kc.mcafee.com/corporate/index?page=content&id=PD27175.
The extension is available in ePO5.9 Software Manager.