Hello,
Simple steps.
If incase, you have a managed SEP client which makes sure that the AutoRun.inf should not be allowed in the environment and you want to make this 1 single machine as exception then, here are simple ways.
1) Move this client to a new group which has no Firewall Policy and Application & Device Control Policy.
This can be done by Withdrawing the Policy from the Group.
Restart of the machine is necessary.
OR
2) You can Deploy another package (using autoupgrade or deploying a new custom package) without the Network Threat Protection and Application & Device Control Feature.
NOTE: Restart of the machine is necessary.
Understanding: Network Threat Protection (Firewall) and Application and Device Control runs on Drivers installed on the machine during Installation of the SEP client. And, to Install / Uninstall these Drivers, you Require a Restart.
Incase, if it's a UnManaged Client then, Simply Disable the Network Threat Protection Policy by:
SEP client > Change Settings > Network Threat Protection, configure Settings > uncheck Enable Firewall.
Restart is necessary.
OR
Uninstall the Network Threat Protection and Application & Device Control Feature from SEP client from the Add/Remove Programs.
Restart is necessary.
Hope that helps!!