Hi Swapna,
I guess 6.4 is more stable that any other version whatever released till now.
Wait for version 7 which may release in recent future. So try to upgrade their. Also 6.11 will come after a month so wait till a stable version comes.
And here check any known issues here before upgrading here for any version
https://portal.blueprism.com/customer-support/support-center------------------------------
Amlan Sahoo
RPA Consultant
Equinix
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Regards,
Amlan Sahoo