The original online installation address is:
http://veloeclipse.googlecode.com/svn/trunk/update/
However, because Google's related websites are blocked in China, they cannot be accessed under normal circumstances.
Offline installation is now available:
Go to Baidu Cloud to download the Veloeclipse offline installation package: veloeclipse.zip
Then import and install through "Install New Software..." in Eclipse.
Later, it was found that for the Luna Service Release 2 (4.4.2) version, an error occurred during installation. Finally, it was solved by referring to the link: