Hi,

I was facing repeated AJAX errors while importing.

After checking the error logs, I made two fixes.

First, the following lines in product-csv-import-export-for-woocommerce/includes/importer/class-wf-prodimpexpcsv-product-import.php

$abs_url    = str_replace( trailingslashit( site_url() ), trailingslashit( ABSPATH ), $url );
$new_name   = wp_unique_filename( $upload_dir['path'], basename( $url ) );

should be replaced with:

$abs_url    = str_replace( trailingslashit( site_url() ), trailingslashit( ABSPATH ), urldecode($url) );
$new_name   = wp_unique_filename( $upload_dir['path'], basename( urldecode($url) ) );

(The file name is being fetched from a URL, which can/should be URL-encoded.)

Secondly, I increased the memory limit.