Session Start errors, conflicts with other plugins

Unfortunately, I just updated via the website to version 1.4 and now it’s not working.

Additionally, the previous version 1.2 is no longer available to download and the new version shows as 404 when I try to download the zip from here.

Disabling and deleting plugin. Bummer.

Everything okay out there?

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /home/user/my-domain.com/wp-content/plugins/qr-code-generator-widget/qrCode.php:116) in /home/user/my-domain.com/wp-content/plugins/cforms2/cforms.php on line 86

https://www.ads-software.com/plugins/qr-code-generator-widget/