Is there anyway in which Sozi extension can be used with 1.0 alpha. I like the functionality of Sozi within Inkscape much better than the stand alone version, as I can make changes on the go.

Or will I have to install an earlier version and work with it?

As far as I recall, Sozi became a standalone program from Inkscape, a few versions back. So I don't think it will be available with 1.0.  Let's see if I can find the last version where Sozi was an Inkscape extension....

It looks like Inkscape version 0.91 was the last version where Sozi could be installed as an extension.

How to install -.91? I have Fedora 31, even with dnf --showduplicates list inkscape the oldest version is 0.92. Is intalling 0.91 manually from the rpm the only choice?

You can install any version of Inkscape (as long as your computer is compatible).  Here's 0.91:  https://inkscape.org/release/inkscape-0.91/

And the main download page offers all the other versions (in the column on the right)  https://inkscape.org/release/inkscape-0.92.4/

I'm not familiar with Fedora, so don't know what "dnf" or "rpm" is.  Are you able to download from our website?  Or can you only get programs from Fedora site?

Thanks for the link. dnf is a command line package manager, .rpm is a extension of packages. Will see if I can install from the sources.