And now we have reached number five

I purchased Lightroom 4 this past December, installed in a beefed up laptop with an i5 and 8 gigs of ram and have still not used it being very happy with my Version 3.6 in my X-P machine. About a week ago, this machine finally bit the dust so I was planning on using the Version 4 on the Windows 7 laptop PC. And now this....Version 8. Well I must first use and learn version 4 before I upgrade. I may not even upgrade for all I know.