Document Converter 1.2 - fields are greyed out
I have downloaded the latest release of the Quark Document Converter 1.2.
The installation tells me that the certificate is outdated but I can install it on both a MacPro running Sierra and a MacBook running High Sierra. On the MacPro the software starts but the converter fileds remain greyed out - and I cannot convert anything.
On the MBPro the application starts, then after awhile there is a spinning wheel and then the grey fields become active. I haven't checked whether it would do soemthing but at least the interface is ok.
What can be wrong with the installation on the MacPro/10.12.6
Thanks in advance