No, think mir only do the recent ones now, such as 1.6 client, and 1.5-1.6 updates.
Why do you want the 1.5 client?
if its to play euro mir, u need 1.6 (i think its 1.6) now, which u can get from
www.legendofmir.net
If its not for that, then sorry i cant help you, unless u look in Legend of mirs FTP