When I run the calculations, I get this message:
Did you delete something from the model (e.g. some part) ? Are there any items in the tree shown as invalid (red) ?
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PrePoMax 2.2: There’s nothing red
LANCUCH 1_2 — kopia.pmx (5.0 MB)
Cleared and no results
The invalid items are all related to compression-only constraint, but removing or redefining it doesn’t help. Apparently, those sets have settled permanently in the input deck. Hopefully, @Matej will take a look at this issue.
Maybe auto regenerating the model’s history from the files you have (including the history file and the CAD files with the imported geometry) would work, but there’s a risk it may fail to regenerate all operations correctly:
You could also edit the history to skip the compression only constraints:
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That looks similar to my chain model https://fatigue.pro/2023/07/a-chain-is-only-as-strong-as-its-weakest-link/.
If you are interested in my model setup you can compare yours with my attached chain model. You can simply import the inp file in PrePoMax.
chain_v1_model.zip (9.7 MB)
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The result looks great. You saved a lot of work thanks to the X, Y, and Z symmetry. I make simple, quick models to make it easier to spot errors and limitations.
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Cool website 
I’ve admired it before. I’m honored by your response. Sorry for any translation errors.