Android Studio 3.6.1 download plug-ins fail

Android Studio plug-in download failed as follows:

After clicking OK, the prompt " Plugin JavaDoc was not installed: Cannot download 'https://plugins.jetbrains.com/pluginManager/?action=download&id=com.github.setial&build=AI-192.7142.36&uuid=73df724d-f0f5-46ef-a4df-780c2e47615f': connect timed out"

Before Android Studio version of the plugin download failed many blog have two solutions, but there is a way to version 3.6.1 no longer applies, that in this way the following:
open Settings-> Appearance & Behavior -> System Settings -> Updates, the following Use secure Connetion removed, because of the use of the https protocol to download problems caused.
Prior versions shots are as follows:

3.6.1 version is as follows:

Under Settings directory also found no other Use secure Connetionoption.

Another way is to IDEA plugin's official website search plug-in and download, unzip into the plugins directory of Android Studio installation directory, and then restart the Android Studio can be.
Detail steps are as follows :

1. Enter the official website, the search plug-in name, I want to download the plug-in is javadoc, this plug-in a little pit father and tell you where to pit later
   
2. Download plugin
   
   
3. After a successful download, the compressed save the package to the place they want to save, I specifically created a Plugins folder is stored locally download plug-ins, and then extract the plug-in archive, folder directory decompression after the lib folder, if it is not lib parent folder should be discarded or more other paths, as follows:
   
   
4. Open the Android Studio installation path, the extract from the folder to the plugin folder
   
   
5. Restart Android Studio plug-ins to see whether the installation is successful
   
   , unfortunately, suggesting Incompatiable with the current Android Studio version
   means that the plug-in is not compatible with the current version of Android Studio.

Then we look at the current version of Android Studio concrete Why? As shown below

and javadocplug-compatible with version 3.1.0 only one version after 142.4783+, 192.7142 version of Android Studio fit the bill, but in addition to 4.0.1 I can not download successfully, it may be necessary over the wall.

To here it becomes clear, because the plug-in is not the current version of Android Studio compatible version, so in Android Studio's Plugins Marketplace unable to download successfully, after the official website to download other versions of the plug-in, even after a successful download to extract the Android Studio installation path under the plugins directory, then reboot Android Studio will prompt incompatible.
This plugin is so pit father, well, so I decided to try JavaDoc2 provided by the same person, and sure enough in the Plugins Marketplace Android Studio can be downloaded successful, interested students can own Quguan network JavaDoc2 steps above and press downloads try success.

Obviously javadoc2 All versions are compatible with more than 142.4783+ version, 192.7142 version of Android Studio is clearly in line with the requirements.