requires me to install firebird 2.5, after I install the software, the installation manager says again that the software is not on my PC. I tried everything and nothing helps.

the repeating message is:

Firebird 2.5 is not installed.

Existing PCB Services database

C:\ProgramData\SOLIDWORKS\SOLIDWORKS PCB Services\dxpserver.dat cannot be upgraded for PCB Services 2020 without Firebird 2.5.

Install Firebird 2.5 and retry or specify a new PCB Services data location.