I have had this issue for some time now. I can't figure out what it causing the issue. My solution is to close down wows, and restart the game. I'm able to re-join the game 100% of the time. At least so far. Usually I just miss the start of the match by a second or two.
The url in Download link #1 is messed up.
http://%20http//rtor.nyx.feralhosting.com/files/Warships/Aslains_WoWs_Modpack_Installer_v.6.6.0_03.exe. I took this out %20http// and was able to download.
According to the WOWS twitch stream, the training room that could be enabled through your config file was broken last WOWS patch. Glad to hear Aslain has a fix.
This has happened to me on and off since I have been using Aslain's pack. I have been using the mod for a long time. Some updates you can buy a slot and sometimes it's not there to buy one.
I'm having some problems as well. I can't download no manga and Scryptar skins. I think my problem has to do with this link and maybe so does your problem.
http://aslain.com/index.php?/topic/6951-mod-installer-not-installing-large-mods/
WoWs Region Changer. Unticking that fixed my DNS problems. I first uninstalled Aslain's. Then reinstalled and went down the list until I found one I thought would mess with IP's and DNS's.
I never used it. I think you can play in different regions with it.