I was recently tried to install a package via pip that gave me an error that suggested that dpup buster has too old a version of qt5 to work with this package. The thought occured to me, "Can I install an older version of this package on pip and if so how do I tell what versions are available".
I found the answer to the second question:
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$ pip install yolk3k
$ yolk -V django
Django 1.3
Django 1.2.5
Django 1.2.4
Django 1.2.3
Django 1.2.2
Django 1.2.1
Django 1.2
Django 1.1.4
Django 1.1.3
Django 1.1.2
Django 1.0.4
https://stackoverflow.com/a/5422144
Here is an example of how to install a specific version:
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pip install MySQL_python==1.2.2
https://stackoverflow.com/q/5226311
In my case this is no use because there is only one avialbe version of the package that I want:
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yolk -V guiscrcpy
guiscrcpy 4.7.2