Dear kamran kazemi,
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Dear SPMers
 
How i can instal SPM5b correctly?

You 'just' have to unzip spm5b into a folder and set the path in matlab (as usually). But be careful, by default zip softwares will install spm5 without the sub and subsub folders.. (thank you to John Ashburner who helps me for this stupid thing ;-) ).

Within the SPM5b folder, you must have15 subfolders and a (sub)subfolder 'private' in the following subfolders: @file_array, @nifti, @slover, @xmltree

Best,
Cyril