I have updated the osclass 4.2.1 but there is no INR option and save the setting changes in Osclass Payments Pro plugin. This is a plugin I was using it for long time. How to fix this issue?

@Sinto001
It has nothing common with osclass upgrade and this plugin is out of support.

So which plugin I use instead this plugin?

You can take a look on osclass pay.
https://osclasspoint.com/osclass-plugins/payments-and-shopping/osclass-pay-payment-plugin-i46

You can take a look on osclass pay.
https://osclasspoint.com/osclass-plugins/payments-and-shopping/osclass-pay-payment-plugin-i46

Its not free

@Sinto001
Even yours is not free.

@Sinto001
Even yours is not free.

I need plugin that is offered by Osclass no third party

There is none offered by osclass anymore, you could notice that.