I took a break from WoW on warmane but today when I try to login after like 6 months or so it says Frostwolf and Frostwolf PTR are offline. I can see people are connected to the server so it must be a problem on my end. Any solution to this? I don't want to re-install the client.
Frostwolf has been upgraded to 5.4.8, I guess you are still using old 5.4.2 client.
So now you have 3 different options:
1) go here: https://www.warmane.com/download and get full 5.4.8 client by selecting "Mist of Pandaria"
2) or by selecting "MoP minimal", it is a 16MB installer which let you play and download the game at same time
3) if you are using 5.4.2 WITHOUT WoD models then you can Upgrade it to 5.4.8 by just downloading the "wow.exe" from 5.4.8 torrent and place it inside your 5.4.2 folder
I did but the game is still 5.4.2 and whenever I log in it says Mismatch with the patches Did Solution Number 3 by The way
Since you are unsure about the status of your files, you should just download the minimal and play from there. Do not merge any files with your current ones and you should be good to go.