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One way to go would be to install Sage 9.1 built for Python 2 (or to compile it from source), then run

sage -n

which will offer to export all SageNB worksheets (.sws) to Jupyter worksheets (.ipynb).

~~One way to go would be to~~ Expanding on Eric's answer.

Solution 1.

install Sage ~~9.1~~ built for Python 2 ~~(or to~~ or compile it from ~~source),~~ source (possible up to Sage 9.1)
then run

run sage -n

-n which will offer to a few choices:

run the old SageNB

export all SageNB worksheets (.sws) to Jupyter worksheets ~~(.ipynb).~~(.ipynb)

run Jupyter Notebook
or directly run sage -n export

Solution 2.

zip the .sage folder that exists in your user account on your computer
open an account on CoCalc if you don't have one,
create a new CoCalc project,
upload the zipped .sage to that new CoCalc project
unzip it there
in the CoCalc project's settings tab, change "software image" from "default" to "Ubuntu 18.04"
in a CoCalc terminal in that project, run sage_select 8.9
in a CoCalc terminal in that project, run sage -n export
then download the resulting .ipynb files back to your computer