Solving a MIP, using PuLP 3.30 and Python 3.13 the highs solver runs as expected when using highs version 1.11 but fails when using 1.12.

What did you do?

MIP modelled in PuLP în Variable prob

from pulp import HiGHS_CMD
...
# problem modelled in variable prob
...
status = prob.solve(HiGHS_CMD(path="highs_v1.12.exe"))

What did you expect to see?

a running programm finding some status

What did you see instead?

FileNotFoundError: [Errno 2] No such file or directory: '...\fbc02af1ef7e4be39614a63d468dadb8-pulp.HiGHS_log'

Useful extra information

doing the same with highs 1.11 everything works as expected

from pulp import HiGHS_CMD
...
# problem modelled in variable prob
...
status = prob.solve(HiGHS_CMD(path="highs_v1.11.exe"))

both versions of highs.exe are the precompiled binaries

What operating system are you using?

• Windows: ( _version: 11 )

I'm using python version:

• 3.13

I installed PuLP via:

• pypi (python -m pip install pulp) , version 3.3.0

Did you also

• Tried out the latest github version: https://github.com/coin-or/pulp
• Searched for an existing similar issue: https://github.com/coin-or/pulp/issues?utf8=%E2%9C%93&q=is%3Aissue%20
  found one but I use the precompiled binaries in the working and not working case, so self compiling didnt cause the issue