First you will have to download the old texture from the following link.
Right click on the downloaded .zip file and then click Extract Here.
This will reveal the old textures in .dat file format.
You can copy any or all the textures to “Documents\Galaincha\Textures”
While copying the silk texture, copy both the SilkTexture.dat and SilkTexture.Large.dat.
If Galaincha is open while copying the .dat file, you will have to restart the program for the changes to take effect.