I have the same exact problem. I also have made posts on reddit and on steam discussions and no one is able to help. I even contacted steam support and they told me there was nothing they could do because it was a "network problem" on my end lol.

That whole thing you mentioned about the thumbnails being the only things that are downloaded from the workshop happens with me too. So I got two friends to send me the .bsp 's and the actual maps themselves AND the thumbnails and manually placed them in my folder. I even named the folders perfectly with their weird 10 digit default folder names.

Didn't work. I even tried "subscribing" after I already had all of the files and the map still wouldn't load.

I also tried changing my crosshair through the console and among others ways. No success.

So yeah, I believe you and I are screwed. But in case one day you figure it out, or someone figures it out, please contact me as many ways as you can as I have been trying to figure this out for almost a year at this point.

I think we only have a few real solutions. Either Valve comes out with their own crosshair creator in CSGO, the bug is acknowledged and they fix it, or we wipe our computers completely squeaky clean and roll the dice to see if it would work. Wiping my computer is something I occasionally have to do two or three times a year. But besides CSGO, there is nothing wrong. I don't plan on wiping just for a chance that it might work. Anyway, i'm frustrated too man. I don't know how long you've had this problem for, but its been a hell of a long time for me so don't expect anything unfortunately.

hi try this solution https://steamhost.cn/steamcommunity_com/workshop/filedetails/discussion/308490450/617328415067873840/ thanks me later

I literally explained in my post that I tried this and it did not work. I tried multiple things and none worked.. Map just doesn't want to download from Steam. As a matter of fact, following your instructions when I go to the folder, the folder is empty..... because as I said the content is not being downloaded from Steam in the first place so nothing to be deleted anyway.. And when I tried asking Steam support for help, it's like talking to a brick wall, very unhelpful.

the only solution is uninstall steam and reinstall it i had the same problem and it worked for me

I'm having the same problem

Same

I have been having the same issue, so far i have. verified integrity of game files, reinstalled windows 10, new steam and csgo install, deleted the cfg folder and all user data in the steam folder. Then re verified the integrity of games files. I have also unsubsrcibed and re subscribed to the crosshair generator. I have deleted folder 308490450. Then reverifed files. When i download or subscribe to the workshop it only downloads two .jpg files to folder 308490450, there is no .bsp file in the folder. I had a friend send me the .bsp map file but it still will not load. It does get further along in the loading process but is stuck on "loading resources" instead of failed to find a dedicated server. This map works fine on my buddys computer at this time he is using windows 7.
UPDATE:
In my attempt to recreate this issue on my windows 7 machine ( In which the workshop maps work just fine), I deleted my map folder and unsubscribed, and resubscribed in order to redownload the crosshair generator map. To my surprise the map quit working on my windows 7 machine and i noticed that the .bsp file was NOT downloaded. So i simply added the .bsp file into my windows 7 machine and bam, the map loaded up and worked fine.
However when i simply add the .bsp file on my windows 10 machine, i do get past the failed to find a dedicated server error, but then i just get stuck on the loading screen and the map never loads up.
The interesting thing is that i could recreate this issue and fix it on my windows 7 machine but the same files i used to fix it on my windows 7 machine fail to fix it on my windows 10 machine.
Either way it really doesn't matter because now there is an evident problem that involves the .bsp files to not be correctly downloaded ( WITH ANY workshop map) on both my windows 7 and windows 10 machines. This appears to be a non-isolated issue as i have also loaded this up on my linux mint machine and i am getting the same errors.
Tl;DR looks like an update is in order

UPDATE NO.2 ( BECAUSE I GAF)
I finally got into this map on my windows 10 machine.
What i did was i took the .bsp file that i got from my friend.
I took that .bsp file and instead of putting it into the workshop folder and trying to load it through the workshop window, i added the .bsp file to the regular csgo maps folder (folder that has all the regular map data) and i pasted it in there.
Then i loaded up the game and on the menu screen just open up Console and type map_xhair_v3
YEsssss

ok i tried it 10 times and on my last computer i take the bsp.file and it worked, if someone wantss, give me your adress mail and i will send the file and you just need to put in the worksjop folder ( 30.......50. Have a good day. Post a message on my profile to add you after and i will send the file (for a knife ;) , nah i'm joking).

1)i reinstall map in cs:go
2)close cs:go
3)delete and setup map
4)launch cs:go
5)reinstall and map working
idk how it working XD