"Error 997. Overlapped I/O Error while installing SEP client, Solution Video with Subtitle

“Error 997. Overlapped I/O operation is in progress” when installing or upgrading a SEP client.
This video will help you to fix the above mentioned issue by following the below mentioned steps or by following the video.

To do this, follow these steps:
Click Start, click Run, type regedit in the Open box, and then click OK.
Locate and then click the following subkey in the registry:
HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindowsInstaller
On the Edit menu, point to New, and then click DWORD Value.
Type SecureRepairPolicy for the name of the DWORD, and then press Enter.
Right-click SecureRepairPolicy, and then click Modify.
In the Value data box, type 2, and then click OK.
Locate and then click the following subkey in the registry:
HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindowsInstaller
On the Edit menu, point to New, and then click Key.
Type SecureRepairWhitelist for the name of the key, and then press Enter.
Double-click the SecureRepairWhitelist key to open it.
On the Edit menu, point to New, and then click String Value. Create String Values that contain the product codes (including braces {}) of the products that have to be added to the Safe Recipients list.
The NAME of the String Value is the “product code” and the VALUE can be left blank.

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