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Hello Rosa, The qdec program is deprecated in 7.X releases and is no longer maintained. In the 7.X releases, you can try using freeview for images and from the command line there are the mri* commands (mris_surf2surf, mri_glmfit, mri_glmfit-sim, etc.) for stream processing. If you still need to run qdec in the Freesurfer 6 distribution, then you could ask your IT department to create a virtual machine or container to host an older copy of your linux OS that supports the correct version of tcl/tk for Freesurfer 6.X and install the Freesurfer 6 distribution in it.   Linux has quemu for built in virtualization which you may already have installed on your server(s).  There is also docker for containers and VirtualBox for virtual machines which likewise can run an older version of an OS and run Freesurfer 6 in those.  Your IT group may support docker and/or VirtualBox as well. - R. On Jul 24, 2022, at 14:41, Rosa de los Angeles Tanzi <tanzi@cbs.mpg.de> wrote:       External Email - Use Caution        Dear FreeSurfer Developers,I'm attempting to open Qdec on my linux server. I used to open it with freesurfer 6.0.0 activated to analyze our local gyrification index data. That version is not available anymore in our service; hence, the Freesurfer version I can use is 7.1.0 and when I tried to open Qdec the following message appears: Can't find a usable init.tcl We tried to contact our IT sever to see if there was a way we could use our old Freesurfer version 6.0.0 (which we used to calculate the LGI). But they replied to us with the following:"A G6 compute server must be used for freesurfer 6.0.0.. The background is that the TCL 8.4.6 used by Freesurfer is very old (from 2008) and is no longer supported by current operating systems. The same applies to the latest version 7.2.0.We have TCL 8.6.11 available."Is there anyway we can install Qdec for this new version of freesurfer 7.1..0? so we are able to continue with the analysis. I am open to any other possible solutions.Kind regards,Rosa_______________________________________________Freesurfer mailing listFreesurfer@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer%E2%80%8B