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Concave Hull Built into QGIS 3.4 as Concave hull

QGIS 3.4 and later do the main job of Concave Hull natively, with Concave hull. You can use that instead of installing the plugin. Processing has computed concave hulls since QGIS 3.4, when this plugin's author added the k-nearest-neighbour method. Current releases use Concave hull (by layer).

Native featureConcave hull
First releaseQGIS 3.4
Where to find itProcessing Toolbox › Vector geometry › Concave hull (by layer), named Concave hull in QGIS 3.40
PluginConcave Hull, last released 2019-01-05
Plugin on QGIS 4Not QGIS 4 ready

How to use Concave hull

  1. Open the Processing Toolbox and find Concave hull (by layer) under Vector geometry. In QGIS 3.40 it is listed as Concave hull.
  2. Choose the input point layer.
  3. Set Threshold between 0 (the tightest hull) and 1 (the convex hull). The default is 0.3.
  4. Choose whether to allow holes, then run it.

Sources: QGIS 3.4 changelog entry QGIS User Manual

A native feature can differ from the plugin in details. If you rely on a specific option, read the linked entry before you uninstall.

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All plugins built into QGIS Plugin page for Concave Hull