I am trying to install Orange and it throws an error message saying that python.exe was not found. I already have python installed. I am wondering what is the problem. 
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I suspect it's looking for Python either in the system path or in the registry somewhere - probably the latter, and getting an empty string when it was expecting a path. If you want to debug this yourself I'd try using procmon with the installer running to try and see how it's trying to detect Python. However procmon is very noisy so might take a bit of work to filter down the data to the bit you need.Rup– Rup2020-04-13 12:07:04 +00:00Commented Apr 13, 2020 at 12:07
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Or there's instructions for checking / fixing the Python registry entries here: How to add Python to Windows registryRup– Rup2020-04-13 12:08:06 +00:00Commented Apr 13, 2020 at 12:08
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