@scottalanmiller
Tried your link. Results:
yum install /tmp/FirebirdSS-2.5.9.rpm
Loaded plugins: fastestmirror
Examining /tmp/FirebirdSS-2.5.9.rpm: FirebirdSS-2.5.9.27139-0.amd64
Cannot add package /tmp/FirebirdSS-2.5.9.rpm to transaction. Not a compatible architecture: amd64
Error: Nothing to do
Server architecture:
Kernel and CPU Linux 3.10.0-1062.18.1.el7.x86_64 on x86_64

@scottalanmiller Tried to install older version downloaded from Firebird:
yum install /tmp/FirebirdSS-2.5.7.27050-0.i686.rpm

Loaded plugins: fastestmirror
Examining /tmp/FirebirdSS-2.5.7.27050-0.i686.rpm: FirebirdSS-2.5.7.27050-0.i686
Marking /tmp/FirebirdSS-2.5.7.27050-0.i686.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package FirebirdSS.i686 0:2.5.7.27050-0 will be installed
--> Processing Dependency: libncurses.so.5 for package: FirebirdSS-2.5.7.27050-0.i686
Loading mirror speeds from cached hostfile

• base: mirror-pl.kielcetechnologypark.net
• epel: fedora.tu-chemnitz.de
• extras: mirror.litnet.lt
• updates: mirror-pl.kielcetechnologypark.net
  --> Running transaction check
  ---> Package ncurses-libs.i686 0:5.9-14.20130511.el7_4 will be installed
  --> Finished Dependency Resolution
  Dependencies Resolved

==============================================================================
Package Arch Version Repository Size

Installing:
FirebirdSS i686 2.5.7.27050-0 /FirebirdSS-2.5.7.27050-0.i686 19 M
Installing for dependencies:
ncurses-libs i686 5.9-14.20130511.el7_4 base 316 k

Transaction Summary

Install 1 Package (+1 Dependent package)

Total size: 20 M
Installed size: 20 M
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test

Transaction check error:
file / from install of FirebirdSS-2.5.7.27050-0.i686 conflicts with file from package filesystem-3.2-25.el7.x86_64
file /usr/lib from install of FirebirdSS-2.5.7.27050-0.i686 conflicts with file from package filesystem-3.2-25.el7.x86_64

Error Summary

Have an installing error.

@scottalanmiller Read https://bugzilla.redhat.com/show_bug.cgi?id=1636177
In my case maybe help to use fbintl from older version 2.5.7. But we don't have where to get this file.
Software that use Firebird database require Firebird 2.5.x server .

@scottalanmiller

Linux version CentOS: Linux release 7.7.1908 (Core)
Results of command: file /usr/lib64/firebird/intl/fbintl.so
/usr/lib64/firebird/intl/fbintl.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=ca4cee9d4aefa05bb0685326a13c3be7c424fdc6, stripped

Hello.
After firebird update to version 2.5.9 not work fbintl. (error in log: Can't load INTL module '/usr/lib64/firebird/intl/fbintl.so')
Any ideas how to repair this error?
we user firebird superserver.