Use Admin to login below URL:
In left, click "Gatekeeper", edit option FILES_ENABLE_FOLDER_ZIP_DOWNLO
No need to restart server to take effect.
When you open a folder of Connections files again, you can see "download this folder" option. Click it, then you can download all files under this folder.
a. "download this folder" can download files under this folder only, can not download files under it's sub-folder.
b. after enable this setting, if the number of files that needed to be downloaded is large or multiple users download files simultaneously, it may cause server performance issue.
c. not recommend to modify other settings of Gatekeeper.