The progress bar not moving means package installer stalled. So package installer is installed, but not CB. Extract CBs package from that zip file from the /extensions/packages folder and try installing that directly to see if any errors output. If package install extensions in Extensions > Manage then uninstall it as maybe you've a broken package installer that won't clean up.
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Within System > Manage > Extensions ensure "Package Installer" doesn't exist. If it does uninstall it. My guess is you've a bugged install maybe due to attempting to install CB before it was J4 ready.
I don't know what else to suggest other than you likely have a permissions problem preventing it from finding or installing the packages or even possibly something JS related just breaking the installer JS.
I am unable to reproduce your issue across 2 different installs (latest RC1 and latest Github). This has been the only report of this happening though so it's likely isolated to your site or server. Please PM backend super user login credentials and will try to debug the installer and see what could be failing exactly.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
Read FAQ thoroughly
+
Read our Documentation
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Search the forums CB links:
Documentation
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Localization
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CB Quickstart
-
CB Paid Subscriptions
-
Add-Ons
-
Forge
-- If you are a Professional, Developer, or CB Paid Subscriptions subscriber and have a support issue please always post in your respective support forums for best results!
-- If I've missed your support post with a delay of 3 days or greater and are a Professional, Developer, or CBSubs subscriber please
send me a private message
with your thread and will reply when possible!
-- Please note I am available Monday - Friday from 8:00 AM CST to 4:00 PM CST. I am away on weekends (Saturday and Sunday) and if I've missed your post on or before a weekend after business hours please wait for the next following business day (Monday) and will get to your issue as soon as possible, thank you.
-- My role here is to provide guidance and assistance. I cannot provide custom code for each custom requirement. Please do not inquire me about custom development.