Trouble with Astah plugin SDK due to access error to Maven repository

From January 15, 2020, connections to Maven’s central repository have been restricted to https.
This may cause errors when using Astah plug-in SDK.
Astah UML’s existing bug information since 8.0.
From January 15, 2020, connections to Maven’s central repository have been restricted to https.
This may cause errors when using Astah plug-in SDK.
When Operations are allocated to the Messages in a Sequence Diagram from the BaseClass of lifeline, rearranging the order of those Operations in Class Diagram by mouse will clear out the allocation.
There is a regression in a Sequence Diagram since Version 8.0.
If there are invalid shortcuts (e.x. the file that the shortcut points is gone…etc.) on the Desktop, a “Missing Shortcut” message appears when you open a file chooser through Astah.
An exception error occurs when trying to change the font color of line labels
■Product and Version: Astah Professional, UML and Viewer | Version 8.0 ■Description: It takes long to load .asta files after updating to version 8.0. ■Workaround: Using Java version 1.8.0_144 for Astah can get you out […]
(Mac) Astah freezes when clicking on blank space in the Startup Screen