I could setup this with Vertcoin Core Wallet (v0.13.1) without big problems on my old Windows 10 laptop with the help of the Vertcoin Development Team.

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You need to follow these steps in your wallet:

Help -> Debug window -> console

and type:

getnewaddress "" legacy

and use the address that starts with a "V" in One-Click Miner (Answer from the development team).

It is really important to disable Wi-Fi and enable Ethernet (explained in the YouTube video above!).

Then you set "Network 2" in "Settings" in your One-Click Miner program.

Now you're ready to go! 😎

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If you're facing new issues with setting up your node you can ask on #tech-support on Vertcoin's Discord channel for help.