How do I convert Lightroom 3 to Lightroom 4?

I saw no dialog re converting on download of LR4.. I assume I don't have to re-import all those files,  Also, upon "conversion," does LR3 just go away, then?
Thanks for helping.
Gail 

There are three steps involved:
Download LR4
Install LR4
Upgrade the LR3 catalog to LR4 format
I saw no dialog re converting on download of LR4.. I assume I don't have to re-import all those files,
The conversion takes place when you open an LR3 catalog using LR4. The conversion process takes a copy of your LR3 catalog and converts that to the LR4 format.
Also, upon "conversion," does LR3 just go away, then?
LR3 will stay installed after installing LR4. You can uninstall it manually.
Beat

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