I installed this without any problem on 3.4.03. The last two editing instructions for topic.asp is the only place I ran into some slight differences.
There appears to be too much space above and below the avatars in posts but I'm not sure how to correct that. (see the link to my forums for an example).
so it should be no problem to implement Avatar Mod in v3.4.0.3 just step by step, and make sure your modification according to the readme instruction.
and Therion93, i think the above blank line is reserve for showing Title/Rank Star.. and the below blank.. just a little seperate from different author infomation section... so your situation should be just "normally" by default...
but if you want to change this style.. above the Avatar showing code, it should be a line like this.. Response.Write " <p>..........." just change it to Response.Write " <p style='margin-bottom:0'>..........."
and below the Avatar code, similar doing.. change it to Response.Write " <p style='margin-top:0'>..........."
and there are two places/section need the same modify. one about line.590(for replies) and another about line.798(for topic)