PHP warnings since last update?

Hi folks,
We’re running the latest verson on PHP version 7.4.25 and are now seeing PHP warnings in the backend when adding a PDF document. Here are the errors with specifics removed for security/privacy:

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Warning: Use of undefined constant BSK_PDFM_PRO_PLUGIN_DIR - assumed 'BSK_PDFM_PRO_PLUGIN_DIR' (this will throw an Error in a future version of PHP) in /home/customer/www/-----------/public_html/wp-content/plugins/bsk-pdf-manager/classes/dashboard/pdf.php on line 1176

Warning: copy(BSK_PDFM_PRO_PLUGIN_DIR/assets/index.php): failed to open stream: No such file or directory in /home/customer/www/-----------/public_html/wp-content/plugins/bsk-pdf-manager/classes/dashboard/pdf.php on line 1177

Warning: Cannot modify header information - headers already sent by (output started at /home/customer/www/----------/public_html/wp-content/plugins/bsk-pdf-manager/classes/dashboard/pdf.php:1176) in /home/customer/www/-----------/public_html/wp-includes/pluggable.php on line 1340

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I hope you can shed some light on this mystery.
We look forward to hearing from you.
Cheers!