Windows Server 2008, 2012, 2012R2 are no longer supported (requires Windows Server 2016 and up)
Windows 10 or 11 Pro edition (Home edition is not supported and may cause issues, and will not receive any support from Spire)
Windows 7, 8, 8.1 are NOT supported (requires Windows 10 Pro and up)
Requires Microsoft Edge or Google Chrome browser on the Server

Please take particular note if you are at the lower end of the requirements, or only meet the minimum requirements. It is probable that your hardware and/or Windows version may no longer be supported in the near future.

Please also see the Spire website for the latest specs: https://www.spiresystems.com/requirements/

Microsoft's support of Windows Server 2012 R2 ended Oct 10, 2023.

Location of the Spire database: The Spire database MUST be located in the default location of C:\ProgramData\Spire\... of the server. Locating it elsewhere can lead to technical problems, an inability to successfully install Spire Server, and problems upgrading later (even a minor upgrade).

Remote Access to Spire

Accessing Spire via a VPN (or not), or in any way over the internet is NOT recommended. Internet connections are too slow and there is a high probability of data loss.
Spire must be accessed remotely using some sort of remote access tool, such as RDS/RDP, Teamviewer, LogMeIn, etc.

SPIRE SERVER

Server software

Windows Server 2022, 2019, 2016 (NOT 2012 or 2012R2).
Windows 11, 10 Pro editions only (NOT Home editions) (only up to about 5-10 users).

Server hardware - Recommended

i7 or 2.8 Ghz Xeon or better
16-32 GB RAM
display with native resolution of 1024x768 or greater
5-10GB available space (depending on database size etc)
SSD drives are strongly recommended
1 Gb LAN (Gigabit), wired
Please do not run Spire across a Wireless WiFi network connection

SPIRE DESKTOP

Desktop software

Windows 11, 10 (Pro editions only, NOT Home editions).
Windows Server 2022, 2019, 2016 (NOT 2012 or 2012R2).

Desktop hardware - Recommended

i5 or 3.06 Ghz, i7 is better
8GB RAM minimum, 16 GB RAM is best
display with native resolution of 1366x768 or greater
(multiple displays and high DPI displays are supported)
1920x1080 is better
1 Gb LAN (Gigabit), wired
Please do not run Spire across a Wireless WiFi network connection
SSD drives are strongly recommended

ADDITIONAL IMPORTANT POINTS

Windows Server 2012 R2 has now been be dropped from the supported Windows versions
All Windows Updates should be current
Please be sure various drivers used by Windows are up to date - run Windows Update prior to installing or upgrading (graphics, printers, etc)