Hi,
If you can not find the version of OCS, you must be in version 2.2 which does not display its version :
https://github.com/OCSInventory-NG/OCSInventory-ocsreports/commit/86ad90aed1381631a21c8a6d1e03bfcc6f0722e0
You can check it on the server:
# grep GUI_VER_SHOW /usr/share/ocsinventory-reports/ocsreports/var.phpdefine("GUI_VER_SHOW", "2.2"); // GUI Version
Regards