If you purchase a Windows product, Please use the shortcut key win+r and then enter winver to check your current windows version to avoid purchasing the wrong version. if your windows is Pro Please buy Pro version, and vice versa.
The software key will sent to mailbox your registed email or the third part login email. any questions please use livechat or send email to support@ucdkeys.com
if you purchase office 2016/2019 please setup.office.com to download app. if office2021 please click here download