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Kickstart doesn't start and I see only the screen in attach.

You shouldn't be seeing the JPS password prompt, Kickstart thinks this is an encrypted archive.

First, use the reload archives button. I don't have great confidence in that, but it is quick and easy.

Next, re-download the Kickstart archive and upload kickstart.php again. If the file has been damaged in transit, this will fix the problem. That would be very unusual, but it does happen from time to time.

I have 4 Joomla website.
I backed up from the old server and installed it in XAMPP where I tested them.
Now I'm doing the restore on the new server and all four give me the same problem.

The kickstart.php (ks.php) file on the server can be read with filezilla.
Same for the language file.

I did the transfer with filezilla twice (binary and auto).

Javascript is active, both in Chrome and in Firefox.

I tried with two Internet connections and with two PC, in Linux and Windows 10.

I tried in Chrome, Firefox, Chrome "Private".

I have also restored 4 Wordpress sites with BackupBuddy, without problems.

I tried in a new VPS.

4 restore with the same error.

In the Chrome console I see:

Failed to load resource: the server responded with a status of 403 () jquery.min.js
Failed to load resource: the server responded with a status of 403 () json2.min.js
Uncaught ReferenceError: jQuery is not defined at jquery-ui.min.js:5 jquery-ui.min.js:5
Uncaught ReferenceError: $ is not defined at ks.php:688 ks.php:688

Furthermore I see in the console

ks.php:658 GET https://MYDOMAIN/jquery.min.js net::ERR_ABORTED
ks.php:659 GET https://MYDOMAIN/json2.min.js net::ERR_ABORTED
jquery-ui.min.js:5 Uncaught ReferenceError: jQuery is not defined at jquery-ui.min.js:5
(anonymous) @ jquery-ui.min.js:5
ks.php:688 Uncaught ReferenceError: $ is not defined at ks.php:688
(anonymous) @ ks.php:688

Kickstart needs 777 right in the folder.
Solved!