I did it a few weeks ago, with mixed results.

While looking for a canoe, two of three models failed, one worked perfectly.  Also did a fishing rod with no problems.  I did not spend time investigating why those two failed, but maybe you're encountering the same problem.

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD

Ive never had a problem before converting sketchup files until now. The error message I get says the file Im trying to import is too new and to try importing a file older than 2016 but Ive tried files of various age , size, whatever and still no joy.


John

Homebuilt computer - Windoze 10, INTEL i9 9900 k @ 5.1 GHz, EVGA RTX 2080 TI XC ULTRA, 16GB 3100 MHz RAM, Asus  Maximus Hero XI motherboard, Sound blaster Z series. iClone6 & 7 Pipeline, Crazytalk 8, Crazytalk Animator 2, Facefilter, Pop video 3, Hitfilm 4Pro, Cubase 8.5 Pro,

I don't have 2016 installed so I tried up to 2015 (downloaded from 3D warehouse). For a while Sketchup 8 or earlier was to version use (when it was still Google). But I've never encountered (as far as I can remember) that I couldn't use a model at least in one version.

Is it a model you created yourself or downloaded? If the latter, we could test it.

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I just downloaded this model in 3 versions, 8, 15 and 16. 8 and 15 open in 3DXchange without any problems (except for the fact that it is upside down). The 16 model just crashed 3DXchange during loading.

Gerry

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System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.

3dx will not open any sketchup files even ones I have previously had no problems converting. Its only after I updated to 6.42 I've had problems. up till then I've never had a problem with any sketchup file. 
My system is set to open 3dx by default when double clicking a sketchup file. I havent tried using "open" command inside 3dx. I'll try that later as it could be a windoze problem.

Homebuilt computer - Windoze 10, INTEL i9 9900 k @ 5.1 GHz, EVGA RTX 2080 TI XC ULTRA, 16GB 3100 MHz RAM, Asus  Maximus Hero XI motherboard, Sound blaster Z series. iClone6 & 7 Pipeline, Crazytalk 8, Crazytalk Animator 2, Facefilter, Pop video 3, Hitfilm 4Pro, Cubase 8.5 Pro,

I just downloaded this 3d Warehouse model:  https://3dwarehouse.sketchup.com/model.html?id=5847f240511c68c4543df75232f6ff2b  in all formats & it opened with 6.42, no problem at all....

Also downloaded this model:  https://3dwarehouse.sketchup.com/model.html?id=u5d9385fb-9bdb-42fa-8504-9add490d1551
in all formats available & all opened without issue in 3Dxchange 6.42

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iClone Certified Content Developer and Author of the Pinky Frink® Adventure Series & the Pinky Frink® Learning Books
site: Granny J's 3D Attic SKYPE = grannyjsplace email: grannyj@grannyjs3dattic.com
MY RIG: GPU: Dual GeForce GTX 970M | CPU: Intel(R) Core(TM)i7-5930K @3.50GHz| 32.00 GB RAM | OS: Win 7 Pro SP1 | DX11

The models that you linked to are only available up to SU 2015, at the moment it would appear that only SU 2016 models cannot be opened in 3DXchange - see the comments in my post above. It's not something that surprizes me though as SU 2016 is fairly new.



Gerry

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System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.

Ive just tried opening the file that GrannyJ posted and I'm getting the same error. I'm thinking I should reinstall 3dx, it is only since I installed 6.42 I've had any sort of problem with 3dx its normally very stable and reliable.Thanks to everyone who has replied and helped.

John


Homebuilt computer - Windoze 10, INTEL i9 9900 k @ 5.1 GHz, EVGA RTX 2080 TI XC ULTRA, 16GB 3100 MHz RAM, Asus  Maximus Hero XI motherboard, Sound blaster Z series. iClone6 & 7 Pipeline, Crazytalk 8, Crazytalk Animator 2, Facefilter, Pop video 3, Hitfilm 4Pro, Cubase 8.5 Pro,

I've uninstalled and then reinstalled 3dx and still got exactly the same problem. Doh !

Homebuilt computer - Windoze 10, INTEL i9 9900 k @ 5.1 GHz, EVGA RTX 2080 TI XC ULTRA, 16GB 3100 MHz RAM, Asus  Maximus Hero XI motherboard, Sound blaster Z series. iClone6 & 7 Pipeline, Crazytalk 8, Crazytalk Animator 2, Facefilter, Pop video 3, Hitfilm 4Pro, Cubase 8.5 Pro,

Almost all 3DWarehouse models are available in older Sketchup versions, and you should always use an older one for compatibility.