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After browsing the interwebs for awhile, I have found a few simliar cases but no real solution to the problem.  I have the CD copy of the game that I would like to install on my laptop running Chakra linux 3.18.1.  I am getting a POL_Download - MD5 sum mismatch.

Here is what I got after running it in the console,

Looking for python... 2.7.9 - selected
[main] Message: PlayOnLinux (4.2.5) is starting
[clean_tmp] Message: Cleaning temp directory
libGL error: Couldn't dlopen libudev.so.1 or libudev.so.0, driver detection may be broken.
libGL error: Couldn't dlopen libudev.so.1 or libudev.so.0, driver detection may be broken.
libGL error: Couldn't dlopen libudev.so.1 or libudev.so.0, driver detection may be broken.
libGL error: Couldn't dlopen libudev.so.1 or libudev.so.0, driver detection may be broken.
libGL error: Couldn't dlopen libudev.so.1 or libudev.so.0, driver detection may be broken.
[Check_OpenGL] Warning: 
[Check_OpenGL] Message: 64bits direct rendering is enabled
[POL_System_CheckFS] Message: Checking filesystem for /home/user/.PlayOnLinux/
[main] Message: Filesystem is compatible
[install_plugins] Message: Checking plugin: Capture...
[install_plugins] Message: Checking plugin: ScreenCap...
[install_plugins] Message: Checking plugin: PlayOnLinux Vault...
[maj_check] Message: List is up to date
[POL_System_SetArch] Message: POL_ARCH set to amd64
[POL_Wine_SetVersionEnv] Message: Wine 1.3.5 not installed. Installing it
[POL_Wine_InstallVersion] Message: Installing wine version path: 1.3.5, amd64
WARNING. Please use POL_SetupWindow_Init first
WARNING. Please use POL_SetupWindow_Init first
shasum: ./PlayOnLinux-wine-1.3.5-linux-amd64.pol: 
Server sha1 : 2e5b6dcf1233b6fadc5c520d8ccf2a5cf78a5ef3
Client sha1 : 
WARNING. Please use POL_SetupWindow_Init first
rm: cannot remove ‘PlayOnLinux-wine-1.3.5-linux-amd64.pol’: No such file or directory
[POL_Wine_Install_resources] Message: Installing gecko for wine 1.3.5 amd64
[POL_Wine_Install_resources] Message: Linking gecko
ln: failed to create symbolic link ‘/home/user/.PlayOnLinux//wine/linux-amd64/1.3.5/share/wine/gecko’: No such file or directory
[POL_Wine_Install_resources] Message: wine_gecko-1.4-x86.msi already installed. Skipping
[POL_Wine_Install_resources] Message: Installing wine_gecko-1.4-x86_64.msi
[POL_Download] Message: Downloading http://www.playonmac.com/wine/gecko/amd64/wine_gecko-1.4-x86_64.msi
WARNING. Please use POL_SetupWindow_Init first
cat: wine_gecko-1.4-x86_64.msi: No such file or directory
WARNING. Please use POL_SetupWindow_Init first
[POL_SetupWindow_question] Message: question answer: False
[POL_Download] Error: POL_Download - MD5 sum mismatch ! (1 attempt)
[POL_SetupWindow_Init] Message: Creating new window for pid 27888
[POL_SetupWindow_Close] Message: Closing window for pid 27888
[POL_Wine_Install_resources] Message: Installing mono for wine 1.3.5 amd64
[POL_Wine_Install_resources] Message: Linking mono
ln: failed to create symbolic link ‘/home/user/.PlayOnLinux//wine/linux-amd64/1.3.5/share/wine/mono’: No such file or directory
[POL_Wine] Message: Running wine-1.3.5  (Working directory : /home/user/.PlayOnLinux/wine/linux-amd64)
[POL_Wine] Message: Notice: PlayOnLinux deliberately disables winemenubuilder. See http://www.playonmac.com/fr/page-26-Winemenubuilder.html
wine: cannot find ''
[POL_Wine] Message: Wine return: 87
[POL_SetupWindow_Init] Message: Creating new window for pid 27814
[main] Error: Star Wars Knights of the Old Republic crashed.
Click on debug link to get more details.
[POL_SetupWindow_Close] Message: Closing window for pid 27814

I am running PlayOnLinux 4.2.5.

And my system specs are:

Processor: 2.1 Ghz.

Graphics: ATI Radeon HD 3200 Graphics RS780M

Memory: 4096MB

 

Any help would be great.

It looks like it is failing to download wine-gecko and wine-mono. Those are installed automatically, so as long as you have a good internet connection, it should grab those. Try to delete the virtual drive and install again, and make sure you are not using a lot of bandwidth doing something else. It is basically saying that the MD5 does not match, because the file failed to download completely or at all. 

I am actually testing Star Wars:  Knight of the Old Republic this week and it runs flawlessly.  I even got the reoslultion to work at 1600x1200

I hope your video drivers aren't causing any issues.... there are a few LibGL errors in there.  I have a GeForce 550 Ti and KOTOR runs great on the Nvidia 311 drivers.

Do you have the proprietary drivers install for that HD 3200?

It is throwing libudev errors. Seems to be an error with the OS, but I have never tried Chakra Linux. I have to imagine it is the OS that is causing the problem. 
 

Also, 64-bit Wine/POL virtual drives don't work that well. I would stick with 32-bit versions of the game, if available, and I would switch OS, or see if there is a workaround for the udev error. That is the first thing I would take care of.