skunka The new version of template is updated for Joomla 5 so I guess it has backward compatibility with the Joomla 3 version you're using.
You can backup these files and update with attached file (unzip and replace to your site)
/templates/ja_alpha/html/mod_articles_categories/portfolio.php
/templates/ja_alpha/html/mod_articles_categories/portfolio_items.php
/templates/ja_alpha/html/layouts/joomla/content/info_block/category.php
/templates/ja_alpha/html/layouts/joomla/content/blog_style_default_item_title.php