well
decompile the 1.0 model into a new folder, be sure to pic only textures and reference
now decompile the same 1.1 model and be sure to select only animations and qc file and put them in a new folder
copy and paste those animations and qc file into the folder where the 1.0 reference and textures are
go to milkshape, choose tools -> half-life -> compile qc file
let it run, and there, you have the 1.0 model with 1.0 animations