In win xp-sp2, isit ok to install 4.9.37Pro on top of 4.10.9 Basic? or isit a must to un-install first then install?

Normally, when you install one version of LW it will remove the previous version before it installs the new one.

Thanks Birdy for your reply. Being a LW newbie I'm obliged to ask which is better: 4.9.37 Pro or 4.10.9 Basic?

Well, that's a bit hard to answer! Pro will let you connect to more ultrapeers, potentially give you better search results & let you download from more hosts.

But, at the same time, improvements have been made in the newer basic versions. Have a look at the changelog here to see what's been done recently
http://www.limewire.com/english/cont..._history.shtml

Keep the installers for both versions, that way you can change back if you're not happy with whichever version you decide to run.

Hope I haven't confused you too much

Many thanks for your help birdy.
Yes, comparing 4.9.37 Pro vs 4.10.9 Basic is not a clear cut matter for each has its own merits and thus one should keep both installers until the next version.
Best regards.

Your thanks is much appreciated!