Anspress not loading jquery-form

Hello, on my site Anspress is not working properly – front end asking questions does not work: when you press Submit, it reloads the page and nothing happens. An error appears in the console: “Uncaught TypeError: a(…).formSerialize is not a function” (the same when aswering)

Also when I press “upload” (and mouse cursor does not change when hoverin upload or add from link) to upload image, I get to choose a file and then nothing happens. Error in the console: “Uncaught TypeError: a(…).ajaxSubmit is not a function”.

This is version 2.2.0.2.   When I update to 2.3.8, the plugin starts acting even weirder, “upload” link no longer opens a dialogue to choose a file, some symbols are replaced with strange ones (wrong encoding?). ap_get_questions stops working on my website’s front page, breaking the PHP code and it also breaks some of my design. So somehow I preferred to hold onto the older version.

Anspress is using my page.php template.

What should I do?

UPDATE: Manually loaded jquery-form, now it works. Why does Anspress not load it by itself?