I remember what email I used when buying it, but my computer had crashed and I needed to retrieve the download for pro. I spent good money on it. I've checked my email a million times for it and it is gone! How do I get the download for Pro again??

Depends on when you bought your Pro version. The suscription is only good for 6 mnths and just recently been offered for a year. So if its been longer than 6 mnths your e-mail address won't be in the data base any longer. If you want the updates and "e-mail support" that they offer, then you will have to re-purchase.
Or Use Basic which is Free. Not much difference between Basic & Pro.

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I Don't Suffer From Insanity, I Enjoy Every Minute of it

If you have a decent line then just use the Basic version,stay connected and let yourself connect as an UltraPeer (UP), which will give you much better search results.

Even if you are not automatically chosen to be one, if your average connect time to the network is high enough, then you can just force it yourself by deleting the UPs you are connected to until you start getting many more connections (max is 32UPs and 32 leaves).

Also newer Limewire versions are to my knowledge not bug free, so you might want to use an older version. Just uninstall using the uninstall.exe in your Limewire program folder.

I had very good results using v4.12.06 but that might not be the case for you. It seems it depends a bit on computer setup.

Anyways, You can find older versions here: Download LimeWire Basic 4.12.6 - filehippo.com

Note: Limewire didn't have BitTorrent support until v. 4.13 but since their BitTorrent support sucks anyway, just use a proper program for that e.g. Azureus or uTorrent.