Timer crash my site

The free version works just fine, but when updating to the paid version, the site goes down (WP report critical error).

A few days ago this was not a problem. We did not change anything, so there must have been another automatic update of some sorts. I do not know.

I have tried to delete everything and reinstall the plugin from scratch, but every time the same error happens. I do not know what to do.

Detalis:
==================
An error type E_ERROR happened as a result of linje 845 in the file /home3/infokana/public_html/bingokanalen/wp-content/plugins/sctv-sales-countdown-timer1/includes/admin/countdown.php.

Errormessage: Uncaught Error: Call to undefined function wc_get_template() in /home3/infokana/public_html/bingokanalen/wp-content/plugins/sctv-sales-countdown-timer1/includes/admin/countdown.php:845
Stack trace:
#0 /home3/infokana/public_html/bingokanalen/wp-includes/class-wp-hook.php(292): VI_SCT_SALES_COUNTDOWN_TIMER_Admin_Countdown->settings_callback(”)
#1 /home3/infokana/public_html/bingokanalen/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters(”, Array)
#2 /home3/infokana/public_html/bingokanalen/wp-includes/plugin.php(484): WP_Hook->do_action(Array)
#3 /home3/infokana/public_html/bingokanalen/wp-admin/admin.php(259): do_action(‘toplevel_page_s…’)
#4 {main}
thrown