Hey there, kaeloc. I'll help you with your question about QuickBooks 2012.
You can still use this version to keep records for your business by making manual entries, but there will be some limitations. For example, services like payroll, online backup, payment processing, online banking, and any other features which require an internet connection won't work due to our discontinued support for the product.
If you want to use electronic services in your books, you'll need to upgrade to a newer version. Presently we still support 2018, 2019, and 2020 for using e-services within the software.
I've included a few resources below which you may find useful:
As long as you are able to install the license and activate it on your machine, you may keep using it. I would not recommend running unsupported QB version on a supporting Windows OS. In case you only have a machine with Win 8.1 or Win 10, consider upgrading your license to QB 2020. As a non profit, you may purchase the new license thru Techsoup with a special price (i.e Premier 3 users for $150).