Not all terrains are part of CUP. In fact some terrains do not require CUP at all. Many are on Steam, but some still require to be downloaded and installed manually.

I think the Steam version of Thirsk Island is shown as incompatible because it hasn't been signed and therefore may not work on a server. but for singleplayer use including this scenario it works fine.

Dear Alky Lee;
Sorry for bothering you. I just realized that this mod required the map from armaholic.(I thought that the map would be a part of default CUP maps.)
I have never owned mod outside Steam workshop. Maybe the absence of the map would be the cause of my termination.

Furthermore, The map you pointed out in the workshop says that It is not compatible with ARMA 3 anymore. I couldn't understand the exact reason for incompatibility (So I will not subscribe the version on workshop.), but I think that you should restore this brilliant mod such as the previous state before I report a bug. I regrets that spoiled your nice and perfect mod by my careless. I'm very sorry for making unnecessary burden.

Thank you again for listening me.

For simplicity I have changed the required items to use the Steam version of the map, although the Armaholic version still works.

BNsonear-I have just checked and it is working fine for me. There is also a version of Thirsk Island on the workshop and the mission works with that version too.

Dear Alky Lee;
Thank you for your nice maps with HWS. Your mod makes ARMA3 single alive!

I have a lot of your HWS maps, but this one (Thirsk Winter) makes severe trouble.

When I load the map in single player - scenarios menu, ARMA 3 is terminated.

Other maps from you are just fine, only this one. I was wondering if you could inspect the problem in your fee time.

Thank you for reading.