Walkthroughs for custom maps.

Are you talking about this video: https://www.youtube.com/watch?v=u0VzX0eKE0A ?
Does anyone know what plugin it is and where to download it for quick spell casting with a single click?

Yes, that's exactly the video. The plugin is called SoD SP.

Added 4 minutes later

I need help with the map "The Lord of Rings." I can't figure out how to defeat the hero with the Sphere of Inhibition. He has Cerberuses and Dragons. I tried reducing the number of Cerberuses so they would surround the Harpies and attack the Dragons, but it's very difficult to do with minimal losses. How should I defeat him?:

We were just talking about this battle yesterday >>>

In the first and second rounds, reduce two stacks of Cerberuses to their minimum numbers. In the first round, Black Dragons attack the Ballista; in the second, they double-attack Imps, while the Cerberuses pin down our troops from both sides. The enemy has low stats, so the damage dealt by the Cerberuses is negligible. We eliminate all his troops with Wizards and Harpies. It's tricky to correctly adjust the Cerberus stacks due to the large variance in Harpy damage. To reduce this, you can attack this hero with Orrin instead of Gundula. And the two supporting stacks could be some units that aren't necessary for us, rather than Archmages and Black Dragons, because I lost several of them in this battle.