Are upgrades free of charge?
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All upgrades are free.
Upgrading NodeBB.
https://docs.nodebb.org/en/latest/upgrading/index.html
For our SaaS hosting and enterprise clients, all upgrades are performed by our team. Frequency varies but the majority of upgrades occur during off-peak hours. If you are self-hosting and do not have a monthly support plan, you would manage this yourself unless.
Downtime
Downtime is usually just a few minutes at most and will be scheduled at off-peak hours whenever possible. We will contact you in advance if longer downtime is required.