How can I update WPBakery Page Builder from 6.1 to 6.5?

Hi, I'm trying to update php from 7.3.2 to 8.0.6, the latest version included in xampp (I'm working offline before to publish new site version made with your template... and so I can't give you access to my admin pages).

If I update home page has nothing but menu. I use a PenNews Child template with 6.6.0 version. I tryed to update to 6.6.1 but there's this problem and it doesn't update.

Upgrading the theme…

Backing up the old version of the theme…

Fatal error: Uncaught ValueError: fread(): Argument #2 ($length) must be greater than 0 in C:\xampp\htdocs\isole-greche\wp-admin\includes\class-pclzip.php:2677 Stack trace: #0 C:\xampp\htdocs\isole-greche\wp-admin\includes\class-pclzip.php(2677): fread(Resource id #2435, 0) #1 C:\xampp\htdocs\isole-greche\wp-admin\includes\class-pclzip.php(2508): PclZip->privAddFile(Array, Array, Array) #2 C:\xampp\htdocs\isole-greche\wp-admin\includes\class-pclzip.php(2410): PclZip->privAddFileList(Array, Array, Array) #3 C:\xampp\htdocs\isole-greche\wp-admin\includes\class-pclzip.php(2145): PclZip->privAddList(Array, Array, Array) #4 C:\xampp\htdocs\isole-greche\wp-admin\includes\class-pclzip.php(413): PclZip->privCreate(Array, Array, Array) #5 C:\xampp\htdocs\isole-greche\wp-content\plugins\easy-theme-and-plugin-upgrades\custom-theme-upgrader.php(139): PclZip->create('C:/xampp/htdocs...', 77003, 'C:/xampp/htdocs...') #6 C:\xampp\htdocs\isole-greche\wp-content\plugins\easy-theme-and-plugin-upgrades\custom-theme-upgrader.php(51): CAJ_ETPU_Theme_Upgrader->create_backup('C:/xampp/htdocs...') #7 C:\xampp\htdocs\isole-greche\wp-admin\includes\class-wp-upgrader.php(560): CAJ_ETPU_Theme_Upgrader->clear_destination('C:/xampp/htdocs...') #8 C:\xampp\htdocs\isole-greche\wp-content\plugins\easy-theme-and-plugin-upgrades\custom-theme-upgrader.php(40): WP_Upgrader->install_package(Array) #9 C:\xampp\htdocs\isole-greche\wp-admin\includes\class-wp-upgrader.php(797): CAJ_ETPU_Theme_Upgrader->install_package(Array) #10 C:\xampp\htdocs\isole-greche\wp-admin\includes\class-theme-upgrader.php(250): WP_Upgrader->run(Array) #11 C:\xampp\htdocs\isole-greche\wp-content\plugins\easy-theme-and-plugin-upgrades\admin.php(41): Theme_Upgrader->install('C:\\xampp\\htdocs...') #12 C:\xampp\htdocs\isole-greche\wp-includes\class-wp-hook.php(292): CAJ_ETPU_Admin::update_theme('') #13 C:\xampp\htdocs\isole-greche\wp-includes\class-wp-hook.php(316): WP_Hook->apply_filters('', Array) #14 C:\xampp\htdocs\isole-greche\wp-includes\plugin.php(484): WP_Hook->do_action(Array) #15 C:\xampp\htdocs\isole-greche\wp-admin\admin.php(408): do_action('admin_action_up...') #16 C:\xampp\htdocs\isole-greche\wp-admin\update.php(16): require_once('C:\\xampp\\htdocs...') #17 {main} thrown in C:\xampp\htdocs\isole-greche\wp-admin\includes\class-pclzip.php on line 2677

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How is it possible to solve it?

I can't open new ticket because system reply me: "

• È necessario inserire il codice di acquisto Envato Market associato a questo prodotto.
• (You must enter Envato Market purchase code associated with this product)

>>> Please check the PHP ZIP module, then upload your WordPress to the latest version and try again.

I tried many times, in different ways. Always the same.

>>> If the problem doesn't solve, please use PHP 7.x on your local server for development.
OK, but I'm afraid whewn I'll go online. I hope will have no problems with server.

What's about problems opening new tickets? Why system replies like that?
(You must enter Envato Market purchase code associated with this product)

OK. Did you try with php 8.x.x?

Perfect... thank you!