First thing I'd suggest is to delete the duplicates. You can use Get Info to see what the versions numbers are.
Now, make compressed versions of the newest version of each app. Select one of the labels and use the Finder->File->Compress menu item. You should now have a compressed version of that item with ".zip" added to the end of the label. However, since you have extensions hidden, I'm not sure you will see that. It might be helpful to show them to keep straight which file is what. Finder Prefs->Advanced->Show all filename extensions.
Now, select the compressed file and press the Return key. That should select the entire name of the file except for the extension. Use the right arrow key and you'll have a cursor sitting just to the left of ".zip". You can now add the version number you previously determined through Get Info. Again, you don't need duplicates of any of these files.
I usually compress the last version of any app just before I install the newest version.
Another suggestion is more like 'housekeeping'. Folders are free! Create some for the ancillary files that might come with any app (if it doesn't already have them). You could use a new folder labeled "Zipped Apps" and put those compressed apps in there. That way you won't see (at least) duplicately named items in a Finder window.
Lots fo WC in it. What should I do ?
Oui= yes Non= no
OK, I think you are showing us the
Option-Apple->
System Information... window, after you select Applications in the Software section. That display has a column labeled "64-Bit (Intel)" [in English]. That column's data is either "Yes/Oui" or "No/Non". There is not much to actually do in that window, it doesn't allow any input from the user as far as I know. It is simply letting you see the version number and other information about all your installed applications. If you are running a 64-Bit computer, you can see if you have 32-bit apps that have been replaced by 64-bit ones. There is not much use in leaving the 32-bit apps on your main, boot drive. I would compress them and move them to an external drive used for backups. Then, delete them from your internal, boot drive.
Hope that answers your concerns!