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For all those experiencing this issue, this may help you out:http://kb.parallels.com/en/113744, just download and run Fix hosts for PDfM.zip,...
@Lance000. Thanks a lot. That worked for me.
After installing Mavericks PD8 would not start. So I uninstalled the previous version of PD8 and downloaded the version 8.0.18608.898384 However...
I hope this helps me. This is the link to the download http://www.parallels.com/directdownload/pd8
ANDREW I have the same issue. PD says "Please check your network connection and try again" when I want to use a trial version of PD9 for Maverick...