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Activation & Licensing Failed to install CostX 6.9 (Error 1557) Reply To: Failed to install CostX 6.9 (Error 1557)


Hi Min,

Thanks for posting on the forum.

Please could you try the following:

1) Ensure all Microsoft Updates have been installed.

2) Any antivirus installed (other then Microsoft Defender) may need to be stopped or removed (if free).

3) Use the right click on the installer file and use “Run as Administrator” for the install.

Thanks, and please contact for further enquiries.

iTWO costX Forum Admin