HUGE THANKS to Spoter and Soulza from Roughnecks Mods for this great mod.
1. Download this: LINK, copy it to World_of_Tanks\res_mods\0.9.5\scripts\client\gui\ This will give you a premium garage with no premium account.
2, Download the actual hangar mod from the download link below, unpack and copy it to the main game folder. (IMPORTANT: do not unpack any of the files inside the hangar mod)