Sync problems exotic question

Dear Zotero community,
One of my computer is (and have to be) running under Windows XP. It is impossible to upgrade it to Win10 or Win7.
I am using Zotero on this old computer, the newest version that is operational is ver. 5.0.77.
The Firefox version I am using on this old computer is ver. 52.9.0 (32bit).
I am aware that most of You are smiling with sentiment, but unfortunately I have to work with that.
I would really appreciate if someone among You could help me how to fix the Sync Problem on the old computer. The error message from the Zotero is the following: " The version of Zotero is too old for sync."
I am aware that for sync I need up-to-date Zotero but I can't due to the operational system limitations. Is there any other solution that enable Zotero sync from WinXP operational system? Can I maybe download a library of JavaScript or something else and add it on WinXP to make the Sync back again?

Thank You in advance for Your help
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