Hello Anand
1. I guess we need to upload and configure a different font for your language. Not sure what's the language you are using? Please submit a support ticket sending us super admin account of your site so that I can check it
2. Depends on how you want to use qr code to checkin registant, you can use [QRCODE] or [TICKET_QRCODE] tag and qrcode should be generated. See
eventbookingdoc.joomservices.com/advance...check-in-registrants
for detailed instructions
Tuan