Dear friend!
The NCE WebLCT V100R021C00CP2103 does not support the DC tool. The last supported DC tool is Network Cloud Engine WebLCT V100R019C00SPC602.
Download link: WebLCT.

To start the standalone DC tool, perform the following steps:
1. Follow the preceding steps to download the Web LCT.
2. Find WebLCT\weblct\dc in the decompression path and click startdc_StandAlone.bat to start the standalone DC.

3. Start the independent DC.

Thank you!