Do not uninstall your 13 BS before installing 14.
Read the PDF ArchiCAD 14 Reference Guide's Migration Guide section - starting on page 81 (English version) which describes how to migrate your server from 13 to 14.
Karl
One of the forum moderators
AC 27 USA and earlier • macOS Ventura 13.6.6, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB