Installing AMD HD6450 driver: fails to install

The AMD driver complains about driver incompatibility. It wants XServer 1.10, which is an old version. Any way to install this version on Debian 9 and Debian 10 (preferred) and keep it from being upgraded?

For Debian 10, is there a way to force Gnome Manager to use low res (640x480 or some such) graphics?

I am aware AMD pulled the plug on Catalyst a few years ago.

This is the output provided by the AMD installation script:

root@debianStretch:/home/john/Downloads/amd-catalyst-15.9-linux-installer-15.201.1151-x86.x86_64# ./AMD-Catalyst-15.9-Linux-installer-15.201.1151-x86.x86_64.run
Created directory fglrx-install.u2wb0n
Verifying archive integrity... All good.
Uncompressing AMD Catalyst(TM) Proprietary Driver-15.201.1151.................................................................[snipped out some dots]
.................................................................................................... .....................................................................
=====================================================================
AMD Catalyst(TM) Proprietary Driver Installer/Packager
=====================================================================

error: Detected X Server version 'XServer 1.19.2_64a' is not supported. Supported versions are X.Org 6.9 or later, up to XServer 1.10 (default:v2:x86_64:lib:XServer 1.19.2_64a:none:4.9.0-12-amd64:)
Installation will not proceed.

Removing temporary directory: fglrx-install.u2wb0n
root@debianStretch:/home/john/Downloads/amd-catalyst-15.9-linux-installer-15.201.1151-x86.x86_64#

[end of script output]

Cheers
John