Where can I find chromium version 34 to install on old pc

According to https://launchpad.net/ubuntu/+source/chromium-browser and https://launchpad.net/ubuntu/+source/chromium-browser/34.0.1847.116-0ubuntu2 trusty tahr still has chromium-browser version 34.* available.

Does that computer already have an operating system installed?
If not, then you could try installing Ubuntu 14.04 (not 14.04.3!! e.g. from http://old-releases.ubuntu.com/releases/14.04.0 ), but do not allow the installation of updates on chromium-browser.

(Remark: I have not verified whether these versions really do run on a non-sse2 cpu)

Manfred:
Thanks for answering. Sorry, the computer already have an OS installed. Here's the info:

williepabon@williepabon-Presario:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty
williepabon@williepabon-Presario:~$

The desktop environment is Xubuntu. Is there a problem that I have Ubuntu 14.04.3?
Thanks.

You just have to downgrade chromium-browser to the older version (if that version really works).

What output does the command

apt-get --simulate install chromium-browser=34.0.1847.116-0ubuntu2

produce?

Manfred:
This is the output requested:

williepabon@williepabon-Presario:~$ apt-get --simulate install chromium-browser=34.0.1847.116-0ubuntu2
NOTE: This is only a simulation!
      apt-get needs root privileges for real execution.
      Keep also in mind that locking is deactivated,
      so don't depend on the relevance to the real current situation!
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 chromium-browser : Depends: chromium-codecs-ffmpeg-extra (>= 0.6) but it is not going to be installed or
                             chromium-codecs-ffmpeg (>= 0.6) but it is not going to be installed
                    Recommends: chromium-browser-l10n but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
williepabon@williepabon-Presario:~$

wp

Ok, that would have been too easy ;-)

Try

apt-get --simulate install chromium-browser=34.0.1847.116-0ubuntu2 chromium-codecs-ffmpeg-extra=34.0.1847.116-0ubuntu2 chromium-browser-l10n=34.0.1847.116-0ubuntu2

and report the output

Manfred:
Thanks for your effort and here it is:

williepabon@williepabon-Presario:~$ apt-get --simulate install chromium-browser=34.0.1847.116-0ubuntu2 chromium-codecs-ffmpeg-extra=34.0.1847.116-0ubuntu2 chromium-browser-l10n=34.0.1847.116-0ubuntu2
NOTE: This is only a simulation!
      apt-get needs root privileges for real execution.
      Keep also in mind that locking is deactivated,
      so don't depend on the relevance to the real current situation!
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  webaccounts-chromium-extension unity-chromium-extension
  pepperflashplugin-nonfree
The following NEW packages will be installed:
  chromium-browser chromium-browser-l10n
The following packages will be DOWNGRADED:
  chromium-codecs-ffmpeg-extra
0 upgraded, 2 newly installed, 1 downgraded, 0 to remove and 202 not upgraded.
Inst chromium-codecs-ffmpeg-extra [47.0.2526.106-0ubuntu0.14.04.1.1107] (34.0.1847.116-0ubuntu2 Ubuntu:14.04/trusty [i386])
Inst chromium-browser (34.0.1847.116-0ubuntu2 Ubuntu:14.04/trusty [i386])
Inst chromium-browser-l10n (34.0.1847.116-0ubuntu2 Ubuntu:14.04/trusty [all])
Conf chromium-codecs-ffmpeg-extra (34.0.1847.116-0ubuntu2 Ubuntu:14.04/trusty [i386])
Conf chromium-browser (34.0.1847.116-0ubuntu2 Ubuntu:14.04/trusty [i386])
Conf chromium-browser-l10n (34.0.1847.116-0ubuntu2 Ubuntu:14.04/trusty [all])
williepabon@williepabon-Presario:~$

Manfred:
Thank you very much! It worked. I'm going to do the last command so that it is not upgraded. Now I need to increase ram to 1 Gig (maximum allowed on this oldie), so that chromium runs a little sappier. Thanks again.
wp

Thanks Manfred Hampl, that solved my question.

Question why does William need v34?

The reason is simple, but many don't know: v36+ requires SSE2 internal instruction set in the CPU.
NEITHER of the 32bit Athlon XP CPUs have this. Absolutely none. The 64bit ones do have it, but if you already had a Socket A (462) mainboard, you were in real trouble.