Improve spyder-kernels installation message

[ghost]

Issue Report Checklist

• Searched the issues page for similar reports
• Read the relevant sections of the Spyder Troubleshooting Guide and followed its advice
• Reproduced the issue after updating with conda update spyder (or pip, if not using Anaconda)
• Could not reproduce inside jupyter qtconsole (if console-related)
• Tried basic troubleshooting (if a bug/error)
  • Restarted Spyder
  • Reset preferences with spyder --reset
  • Reinstalled the latest version of Anaconda
  • Tried the other applicable steps from the Troubleshooting Guide
• Completed the Problem Description, Steps to Reproduce and Version sections below

Problem Description

When I install Spyder 5.0.1 Spyder.dmg on Mac BigSur and I try to change the environment to the conda installation I get:

Your Python environment or installation doesn't have the spyder‑kernels module or the right version 
of it installed (>= 2.0.1 and < 2.1.0). Without this module is not possible for Spyder to create a console 
for you.

You can install it by running in a system terminal:

conda install spyder‑kernels

or

pip install spyder‑kernels

I already have spyder-kernels and installing with conda doesn't change anything.

What steps reproduce the problem?

1. Use Spyder.dmg installer
2. Change to conda python as the interpreter /Users/brian/anaconda3/bin/python

What is the expected output? What do you see instead?

In my Spyder4 version I installed with conda initially after Anaconda installation I can change to the conda env as well as any other conda venv and it works fine.

Paste Traceback/Error Below (if applicable)

PASTE TRACEBACK HERE

Versions

• Spyder version:
• Python version:
• Qt version:
• PyQt version:
• Operating System name/version:

Dependencies

PASTE DEPENDENCIES HERE

[ccordoba12]

Our instructions are not quite explicit about what you need to do. Please run instead:

conda install spyder-kernels=2.0.1

If that gives you an error, please run first

conda update anaconda

[ghost]

great worked with reinstall of Spyder.dmg!

[ghost]

Shoot didn't mean to close if you want to update message in console

[ccordoba12]

Yeah, thanks @bolton-lab for reopening it! I'll update that message with more explicit instructions for our next version.