Impossible issue...

[King Kickass]

I had this problem, what worked for me was uninstall every add on, unsubscribe from every add one. Reinstalling Gmod.

[ForeshadowedDawn]

Avoid downloading.

Install all missing content packs.

From what I see you're downloading a prop from Evocity Props. (http://steamcommunity.com/sharedfiles/fi...=681495119)

Not sure if you're missing anything else. (If you're still downloading the same prop then say so)

Thank you for that Link! I subscribed to that and it downloaded the prop I was stuck on... but now it is stuck on something else.. :/

' Downloading sound/vehicles/boatenginestart.wav '

Also, I cannot install any content packs or avoid downloads. If I set the game to not download any custom content, the game stops responding. And if I try extracting any content packs, it says "Unexpected End Of Data" (7Zip) or "This archive is corrupt" (WinRAR). I have tried leaving it on all day to see if I just needed to leave it for a bit. Came back after 6-8 hours and it was in the exact same place, so it is not that. See why this problem is impossible...? 

Also, I have done that @King Kickass

[DarkN00b]

Just set it to download custom content.

Subscribe to all content packs that FL has.

Here - http://steamcommunity.com/id/fanrstein/myworkshopfiles/
Here - http://steamcommunity.com/id/DharQW/myworkshopfiles/

Also, you can't open GMA (addon file) with Winrar.

[ForeshadowedDawn]

Just set it to download custom content.

Subscribe to all content packs that FL has.

Here - http://steamcommunity.com/id/fanrstein/myworkshopfiles/
Here - http://steamcommunity.com/id/DharQW/myworkshopfiles/

Also, you can't open GMA (addon file) with Winrar.

Okay, I subscribed to all of the packs and just waited on the main screen for them all to download and extract. When it did that, I tried to join but it got stuck on that boatengine audio file again. I have set it to not download custom audio, and now it works.... ish.... it just says not responding now, while saying "Workshop Complete". I left it for about an hour... still nothing.

Screenshot: http://i.imgur.com/00SrAqw.png

( Thanks for the help by the way  )

[GreekAssassin]

Remove all your addons.Uninstall and reinstall Garry's Mod.

[DarkN00b]

Can you print screen your graphic settings in gmod?
Just incase
(gonna respond tomorrow)

[ForeshadowedDawn]

DarkN00b: http://i.imgur.com/1Mz9BEv.png

[DarkN00b]

Did you ever try to join with low graphic settings?

[ForeshadowedDawn]

Yea, does not make a difference. Crashes on "Workshop Complete".

[Adamantite]

Disable downloading custom content
Then join
that should fix your problem