1:Your OS information (E.g.windows 10x64bit).
2:Click on 'Help"tab>"About Foxit PDF Reader" to check its version number.
3:A screenshot of the warning message.
4:When the warning message pop up again,please make sure to check "remember your choice for this application" and hit "OK".

and then go to File tab in Foxit PDF Reader,click Preferences,click Trust Manager tab,click on option Change settings… which is under Open Foxit PDF Reader from applications without valid digital signatures part to bring up Trusted Apps… dialog,please help to check the Apps section in the "Trusted Apps..." dialog box to see if the third party application in which you tried to open PDF file there was already listed there? Then please take a screenshot of the pop-up trusted apps dialog box that you could see on your part.
5:If the third party application is still not listed under the "Apps" section, please help to manually input the full directory of the thrid party application(For example: C:\ROPro210\output\ROPro2.exe ) into the allowed apps click on "Allow" to add it ,click on "OK""OK" to save the setting.

Then open reopen the preferences dialog box again to check if the third party application directory was already listed under the Apps section?
6:If you could manually add the third party application directory under trusted apps list in the preferences dialog box successfully,then please try to restart your Foxit PDF Reader to open PDF file from third party application again to see if this will suppress the warning message?
Look forward to your reply.
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