POS offline Mode erpnext 14 or 15

Is there any solution to run POS offline except from this GitHub - bailabs/tailpos: TailPOS an Offline First Open Source POS for ERPNext link because it seems to be expired and no more working with erpnext 14 or 15.
Please if someone have any solution let me know.

ERPNext does indeed support offline POS functionality. You can refer to the official ERPNext documentation or community forums for detailed information

Thanks for your reply does it open source or it is paid.

This is an ultimate FOSS project! You can check out the repository here.