Couple Questions

I've been wondering.
My new laptop for home now, I practice with, is a Vista machine (X2 Dual core-4gb ram) and has an older Hoster program that freezes when I click on a song. Now I've upgraded to Hoster is 3.321 from 3.316. I did all the suggestion that MTU told me to do to get the Vista machine and Hoster to work together. But Hoster still stops working when I click on a song. It goes to"CUE" and that's it.

The recent an email from MTU tells me to use 3.316 and it should work, but MTU's latest email also now suggest to use 3.321a or 4.08. I can't find 3.315 or 3.321a on the web site. I see Hoster 4.08 and if I buy it, do I buy just the upgrade as I am a current Hoster user? I get a little confused as which one I have, have to get or need to get.
Now on my laptop that I use OUT has XP and Hoster 3.312 which works just fine. So, I was wondering if I get and install the Hoster 4.08 on the Vista machine, will Hoster 4.08 work ok on my XP too without problems?
Another thingy, I was wondering how do I do a search for a song using my XP & Hoster 3.312. My files are all MP3Gs. I've never been able to get the search to work for me even after extensive tries. I've read the manual and read and read & tried & tried. No luck for me. For years I kept 2 programs open, Hoster & Kjpro. I also us an external hard drive with my XP machine if that matters.
Sorry, I guess it was more than a couple question, Hum.
Thanks