Tacx Catalyst

I have a Flow turbo trainer. Can I connect my laptop to the head unit or resistance unit directly and use just the catalyst software to get a visual display or do I have to by the whole PC upgrade at megabucks for the new head unit. Anyone got tips on this or if it's worth it. Advice appreciated - cheers
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I got my i-magic upgrade unit (old green version) second hand from ebay.de for about £60 about 4 years ago.
The current version is available from bike24.com for 179€, / £149
I got my flow from them, Not cheap though
Cheaper here: Bike-dealer24.de @ 139 euro / £120 - Not used them.
P.S I buy a fair bit of cycling stuff from Germany as it's cheaper & no vat/customs problems.