For you example of finding whatsapp version for sets of devices, you can try the following two-step process

1. Generate an "Installed Application (Detailed)" report on targeted groups/devices to output an Excel output file.  Sort/Filter the spreadsheet based on the "Name" and "Version" columns to find out what versions of Whatsapp are there.

2. Generate an "Installed Applications with Name and Version" report to output Excel/pdf output file for each version number found in step 1.  Here, you have to enter "Whatsapp" as the Application Name, and  also the targeted "Version Number".

Though this can be a little bit tedious, but you don't have to wait for anyone to help, and this will very likely be much easier than creating your own custom report from a MobiControl cloud instance. 

Actually, if you are good at writing script to manipulate Excel file, you can just generate the report in step (1) for all devices, and append the device name and device ID in 2 newly added columns before each app item of the corresponding device, and then perform some sorting/filtering function on the application's "Name" and "Version" columns , you can get all you want in 1 step.

Given that you have MobiControl 14.x you could possibly also use the dynamic search options to filter your inventory by specific app versions. The search option allows you to quickly manipulate your filter criteria on the fly in the event that you just want to quickly query something about your device inventory. 

I cannot find the reports called "Installed Application (Detailed)" or "Installed Applications with Name and Version" in the list of available reports. Are those custom reports or were they removed by someone from our instance?

They are canned reports in the Reports tab of Android-Plus platform tab.

I found it thanks!

Sorry for the late reply.