Depending on the location the leak is it would be easiest to plug it.
Can fit a tube though, you would need a 14-2.75, they are approx Bt80.00
Either of the above any scooter shop can sort.
You can keep using 10, it just wont recieve security updates after October.
If you want to upgrade to 11 follow this guide.
https://www.pcworld.com/article/2639634/windows-10-support-ends-soon-heres-how-to-upgrade-to-windows-11.html