我们的公司防火墙不允许直接流向SourceForge的流量，因此我们通过文件共享提供了插件JAR文件。我们使用了以下下载link。
我们发现了一些手动安装插件的说明，但我们没有。看起来这个JAR文件不适合手动安装？还是我们需要采取的步骤？
更新19-09-2019生成以下日志。没有显示dropins文件夹的处理迹象。
eclipse.buildId=4.12.0.I20190605-1800
java.version=1.8.0_191
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments: -product org.eclipse.epp.package.java.product
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.java.product -clean -console -consoleLog
!ENTRY org.eclipse.egit.core 1 0 2019-09-19 15:15:47.713
!MESSAGE Using Apache MINA sshd as ssh client.
!ENTRY org.eclipse.egit.ui 2 0 2019-09-19 15:15:57.883
!MESSAGE Warning: The environment variable HOME is not set. The following directory will be used to store the Git
user global configuration and to define the default location to store repositories: 'C:\Users\myusername'. If this is
not correct please set the HOME environment variable and restart Eclipse. Otherwise Git for Windows and
EGit might behave differently since they see different configuration options.
This warning can be switched off on the Team > Git > Confirmations and Warnings preference page.