I attempted to import the Timeline Slicer visual into a Power BI Desktop report today and instead the Charticulator visual installs instead. I also attempted to download it from Appsource at https:/...
Use direct link as workaround:
Visual: https://appsource.powerbi.com/Timeline.Timeline1447991079100.2.4.0.0.pbiviz
Report: https://appsource.powerbi.com/Timeline.Timeline1447991079100.2.4.0.0.pbix
Save and import from file:
On import select "Import from AppSource"
Power BI have to load the latest version of visual from CDN insted from file.