I tried Shareaza years ago & didn't like it. But some people love it. If you want to try it, go for it.

Download the latest basic LW & just see how it goes, every version behaves differently for different users. When you get to the download page, click to download & then once the dialogue box pops up...cancel that. Now choose the option to downoad the offline installer. There's less chance of installation problems (eg corrupt installation)

Personally, I think Pro's worth the payment. It does connect you to a couple of extra ultrapeers (that's handy if you're searching for rarer files) & connects you to a couple of extra hosts for download. Plus it's a donation to LW's development. But it's up to everyone whether they want to buy Pro. If you're happy with basic then there's no need to buy Pro