First of all - what is the case?
- Title of this post states “LO will not open” – while –
- The detailed description states “None of my spreadsheets or docs will open”
And of course 2. will be a direct consequence of 1. So please clarify, if 1. is the case and fix this before trying to open files by whatever means and of whatever file extension (.odt, .ods, …)
And btw.: What do you mean by “I believe …”? If you downloaded a version and you are not sure, if it is the latest one, just tell us what you’ve downloaded from where and I’m pretty sure someone might be able to tell you whether this is the latest version. And one more thing. Just dowloading the software would of course not assure that you can use it. You need to install the software (I mean with that, that you force readers of your post to make assumptions, since you don’t tell the facts precisely enough).