Aiwa

@Ryan Ashbrook It works now. Thank you!

Actually, several clients were invited to a private feedback group and have been giving us feedback for the past several months on how best to re-approach Invision Community Classic. Our goal was to make self-hosting viable for the future.

Thanks for pointing that out. We will clean that up 🙂 

PHP 8.1 (8.2 compatible) will be the version minimum.
You won't need to re-learn everything, it's not a complete rewrite.
Some things to keep in mind:
We import namespaces so we no longer use fully qualified names. What does this mean?
Old:
namespace IPS\foo class foo { function _construct() { if ( \IPS\Member::i()->isAdmin() ) { $this->bar = \IPS\Request::i()->input; } } } New:
namespace IPS\foo use IPS\Member; use IPS\Request; class foo { function _construct() { if ( Member::i()->isAdmin() ) { $this->bar = Request::i()->input; } } } You *could* use FQN but we no longer do that. The result is a lot neater.
We have also moved most Content interfaces into traits (where it makes sense) and we've introduced a few new dev tools which we'll speak about very soon.
So it's really about cleaning up existing code and moving existing hooks, etc into the new dev tools.
You're not starting from scratch again.
I'll be working on some new dev blogs to go through all the changes in a bit more detail hopefully later this month.

Do you have any modifications installed? One of those might be incompatible with PHP 8.0 since it changed how parent classes in theme hooks are handled.
Try disabling all modifications, switch to PHP 8 and see if the error is gone. If it is, re-enable the modifications 1 by 1 and check when the error appears again. After that contact the developer to let them know so that they can fix it.

I’m alive, COVID tried to kill me, but I’m alive. The application linked above is technically 4.4 compatible, but most have had no issues on 4.5. I’m working on the update for 4.6, slowly but surely. There is more to the app than just the login handler I’m afraid. Also, to meet the IPS MP requirements, which I don’t right now. I’ve got to make some additional code changes beyond just the smaller changes others have had to make.

Let me fix that poor quote cut for you. 
 

I’m alive, COVID tried to kill me, but I’m alive. The application linked above is technically 4.4 compatible, but most have had no issues on 4.5. I’m working on the update for 4.6, slowly but surely. There is more to the app than just the login handler I’m afraid. Also, to meet the IPS MP requirements, which I don’t right now. I’ve got to make some additional code changes beyond just the smaller changes others have had to make.

I’m alive, COVID tried to kill me, but I’m alive. The application linked above is technically 4.4 compatible, but most have had no issues on 4.5. I’m working on the update for 4.6, slowly but surely. There is more to the app than just the login handler I’m afraid. Also, to meet the IPS MP requirements, which I don’t right now. I’ve got to make some additional code changes beyond just the smaller changes others have had to make.

I’m alive, COVID tried to kill me, but I’m alive. The application linked above is technically 4.4 compatible, but most have had no issues on 4.5. I’m working on the update for 4.6, slowly but surely. There is more to the app than just the login handler I’m afraid. Also, to meet the IPS MP requirements, which I don’t right now. I’ve got to make some additional code changes beyond just the smaller changes others have had to make.

I’m alive, COVID tried to kill me, but I’m alive. The application linked above is technically 4.4 compatible, but most have had no issues on 4.5. I’m working on the update for 4.6, slowly but surely. There is more to the app than just the login handler I’m afraid. Also, to meet the IPS MP requirements, which I don’t right now. I’ve got to make some additional code changes beyond just the smaller changes others have had to make.

It’s one of the features from this resource: 
 

It sounds like your server no longer meets the minimum requirements for Invision Community.
The DomDocument extension is enabled by default (and is perhaps missing from your PHP 7.4 build) and is required to run a lot of PHP based software. Please run our requirement checker to see if anything else is missing
 
If that doesn't show anything missing, I would next suggest re-uploading a copy of Invision Community, overwriting your existing files.

Fantastic. Thanks! Conclusion is - I am blind.

And there is the fleshing out of the request: you are referring to the Q&A functionality here.
I will be honest and say that you should implement Google Authenticator instead as your second-step for the ACP, as it isn't static.

Would love an option to have a payment plan for products.
So just like now we have a subscription, just let the automatic billing stop after a set amount of billings.

I currently rely on an rsync cron run daily. The scripts are easy enough to make to ensure you get everything you need backed up. Configuration, databases, folders with dynamic content (user uploads). I have had to use the backups twice in 10 years, sadly. Though one of them was an on demand backup, manually trigger the backup task, so I could migrate more easily to another server. Just make absolutely sure that you’ve got a secure connection between servers. 

CenOS 8 is indeed at the end of its life, so it will be use Ubuntu. When choosing a VPS some operators offer to take KernelCare, Is this relevant ?
 
@Claudia999,
Hosteurope does indeed offer interesting rates. But what if there is a problem with the server, does the technical support charge additional fees?
@The Heff,
Ioso does indeed offer interesting rates (+DNSSEC). But what if there is a problem with the server, does the technical support charge additional fees?
@Aiwa,
I agree with you it is necessary to take a second operator on the condition that it does not subtract by depending on our first host.
@Tripp★,
OVH I will drop it, I have a contact who lost his forum, because the archives were also stored in the same datacenter, a nonsense.
 
 

I don’t trust hosting provider backups. A second VPS, with another provider, in another data center with sufficient storage for data and configuration backups. That VPS can be less CPU and RAM intensive, mine is 1 core with 1gb RAM, but may require larger amounts of disk space depending upon your needs. 
I run a couple of small forums, a handful of Wordpress sites, and the entire Atlassian suite on a single VPS, 8 cores, 32gb of RAM. Generally using about 12gb with another 4-6gb cache. I’m also using webmin. 
You should also consider if you’re going to be using the server for other services, e.g. email or others. 

I wouldn't want to be the guy to test drop these then... I'd have a heart attack!

@Kyle F Ah, ESXi. I have a love/hate relationship. I use it at work almost daily. I manage 3 servers, each running 15+ VM’s. DEV, TEST, and PROD RC. Mostly Windows with a couple small Ubuntu VM’s for applications that run better on *nix OS’s. 
The toys we get to play with in an enterprise setting. Each server is mil spec ( needed for high vibration/shock offshore oil rig installation ). Each server costs ~$30k. ( glad I don’t foot the bill for these puppies )
specs:
(2) 10 core CPU @ 3.(?)Ghz, don’t remember the model , 128Gb DDR4 RAM, 12TB SSD in RAID10. 
All of the individual components, capacitors, expansion cards, CPU, RAM, DOM, etc, are all held in place with some type of silicone compound to handle the vibration and shock. We could drop these servers from 10 feet and they’ll keep ticking. 

I don’t trust hosting provider backups. A second VPS, with another provider, in another data center with sufficient storage for data and configuration backups. That VPS can be less CPU and RAM intensive, mine is 1 core with 1gb RAM, but may require larger amounts of disk space depending upon your needs. 
I run a couple of small forums, a handful of Wordpress sites, and the entire Atlassian suite on a single VPS, 8 cores, 32gb of RAM. Generally using about 12gb with another 4-6gb cache. I’m also using webmin. 
You should also consider if you’re going to be using the server for other services, e.g. email or others. 

😍

Absolutely this. Things happen, even to big name brands. Take just recently for example, a major brand webhost had such an incident where they had a data centre in France get completely decimated in a fire, which caused outages to millions of websites.