VTFEdit is a software tool used to open VTF (Valve Texture Format) files as well as to save tga and other picture files into VTF.

Issues

Texture error 7.5 does not match 7.0 to 7.4

This a common problem that occurs when a VTF file is updated to the latest version. The solution is to trick VTFEdit into thinking the VTF file is a version in the range of 7.0 to 7.4.

Solution

Download HxD or a similar hex editor program
Install HxD
Open the VTF File
In the 00000000 row, under the 08 column it should say 05
Simply change 05 to 04 and save