if you are facing in progress for long time while installing the script, it usually happend due browser mixed content policy.
follow below step to fix this issue
Step 01: go to Install folder open index.php file
Step 02: then open index.php file in any text editor or code editor, vs code is recommend for it, if you are in server you can edit it with your server default editor.
then add this code in your index.php before <head> tag closing.
<meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">
that’s all for fix this issue. now you should able to install the script without any problem, if you still face any issue, please contact your support.