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One thousand thanks Tim Rupp for this workaround!
I am now able to run BIGIP-13.1.1-0.0.4.ALL-ide.ova on Virtual Box Version 5.1.10 r112026 (Qt5.6.2) (all done on Win7)
ChansonNZ - I used 7zip to open OVA file, removed .cert and .mf files as suggested by Ghislain Cote and then edited OVF file as per Tim's guideline. Advantage to use 7zip is that you can just open OVA file and remove included files as well as edit some and then 7zip automatically "compress" it back so no need to uncompress everything prior. I also recommend to use notepad++ as editor - you can edit OVF via 7zip directly but you need to configure notepad++ as editor in settings of 7zip else it uses default windows notepad. Notepad was not parsing the output of OVF properly.