Missing Custom Data Connector > SiteImprove (Beta)

I am not seeing the Options and settings > Options > Preview features and enable “Custom data connectors”. 

I am trying to add the Custom Data Connector > SiteImprove (Beta)

See screen caps below...

Any suggestions?

Session Diagnostics

Feedback Type:
Frown (Error)

Timestamp:
2019-02-14T19:50:36.3913874Z

Local Time:
2019-02-14T11:50:36.3913874-08:00

Session ID:
031d83a4-8bcb-4329-a9f1-533f66ab74cd

Release:
February, 2019

Product Version:
2.66.5376.1681 (19.02) (x64)

OS Version:
Microsoft Windows NT 6.1.7601 Service Pack 1 (x64 en-US)

CLR Version:
4.7 or later [Release Number = 461814]

Peak Virtual Memory:
3.72 GB

Private Memory:
273 MB

Peak Working Set:
376 MB

IE Version:
11.0.9600.19236

User ID:
d455b0f4-789d-4822-9f14-6a3cb6d16ce6

Workbook Package Info:
1* - en-US, Query Groups: 0, fastCombine: Disabled, runBackgroundAnalysis: True.

Telemetry Enabled:
True

Model Default Mode:
Empty

Snapshot Trace Logs:
C:\Users\mnolan\AppData\Local\Microsoft\Power BI Desktop\FrownSnapShot1906962194.zip

Performance Trace Logs:
C:\Users\mnolan\AppData\Local\Microsoft\Power BI Desktop\PerformanceTraces.zip

Disabled Preview Features:
PBI_shapeMapVisualEnabled
MIntellisense
PBI_SpanishLinguisticsEnabled
PBI_PdfImport
PBI_ColumnProfiling
PBI_variationUIChange
PBI_PythonSupportEnabled
PBI_showIncrementalRefreshPolicy
PBI_showManageAggregations
PBI_FuzzyMatching
PBI_EnableWebDiagramView
PBI_improvedFilterExperience
PBI_qnaLiveConnect
PBI_keyDrivers

Disabled DirectQuery Options:
TreatHanaAsRelationalSource

Cloud:
GlobalCloud

DPI Scale:
100%

Supported Services:
Power BI

Formulas:

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