You will need to upgrade 5.7.1 to LR CC using the Creative Cloud app as the LR6 Catalog will not open with LR 5.7.1. If the Windows computer is only a 32bit device, you have problem as LR CC is a 64bit only program. You log in to the CC app with your Adobe ID and download the software.
My problem/issue is, I've tried to open the Lightroom catalogue.
Explain what happens when you try. Give us details. Give us the exact complete unedited word-for-word error message.
Also state how you are trying to open the Lightroom catalog. Tell us the exact steps, in detail.
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Download & Install instructions https://forums.adobe.com/thread/2003339 may help
-includes a way to go to a page to download Adobe programs if you don't have a disc or drive
-you will need to enter your original serial number during install for non-Cloud programs
-Cloud Getting Started https://helpx.adobe.com/creative-cloud.html
-or kglad links in reply #1 here https://forums.adobe.com/thread/2081216 may help
Thank you. I will go and have a look.