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You need a string or something like it to hold down the tooth of the freehub. Then you push the assembly along the axle just enough so that some of the tooth are engage. You then remove the string and push it all the way. Just need to tighten the bolt after that. No special tool required
If it’s just spinning it’s because those 3 silvermetal bits (pawls) are stuck down, which it looks is the case here. There should be a spring that wraps around them all that makes them pop up to make contact with the ratchet ring in the trainer. Or it may be each pawl has it’s own small spring underneath. If it’s a wrap around spring (more likely since all 3 are affected) make sure it is sitting in the small groove in the middle of the pawl and not holding it down. If they pop up push the freehub back on and rotate it backwards slowly while gently pressing and it should pop back on. If the pawls aren’t cooperating you can push them down with a pokey tool of some kind while rotating and it should install.
I’ve sold my Zwift Hub on eBay. When packaging I couldn’t remember if the cassette was fitted from factory or not and removed it using the fixing at the end. I since learned the cassette was fitted but can’t get it back on. Any ideas? When I sit it on and refit the fixing it simply spins. I did give a light tap with a rubber mallet but it didn’t pop back into place and I wouldn’t want to hit it any harder.
So you didn’t just remove the cassette, it looks like you actually took apart the freehub. Look up how to install a freehub. Or otherwise take it into a bike shop.
Short answer is you need a chain whip, a lock ring tool, and a large crescent wrench or torque wrench to separate the cassette from the freehub, then reinstall the freehub on Zwift Hub (tightening its nut/whatever to correct torque), then reinstall cassette on freewheel (tightening lock ring to correct torque).
Last time I took my cassette off, the freehub came off with it like this, meaning (I think) that either I had overtightened the lock ring putting it on, or (more likely I think) Zwift doesn’t tighten the freehub to sufficient torque when installing them.