LiveG

What logs would those be? If you click the Fix This button, what do you see?

I think that it will benefit you greatly. Seeing your recent topics here where you have to deal with several issues, if you move to the cloud those problems will be a thing of the past.
 
The biggesest adavantage for you will be that you will not have to deal with the tech side of things anymore, but concentrate on building and managing your community. Not to mention the security and the reliability. In short you will have piece of mind.
Regarding disadvantages I don't see any at all. 

I'll let some of those who have already moved answer more than myself, as I understand it can be important to come from customers rather than staff. However just wanted to let you know on the cloud move side of things.
Essentially, you provide us with the files in a zip, and your database in a zip. We then do the move to cloud on a mutually agreed date. The only other thing you need to do is to add records on your domain, or point your whole domain to us (depending on the domain being used).
The brief answer really is, as painless as possible 🙂 
I can get you a ticket opened with our sales team if there is anything else you need to discuss of course

As someone who went through this year ago… I can talk about my own experience. 

Moving to the cloud has been a good choice overall. I’m very happy with the decision. I no longer need to worry about things like Apache, PHP, MySQL, etc. I no longer have to optimize the configurations for each of the systems for performance. I also no longer have to worry about things like firewall tuning and scaling for bot traffic etc. At the end of the day… it’s like using Gmail.  I just simply use the service. 

The hardest part of the experience was simply letting go.  I can’t go play in the database anymore. I can’t go manually edit a file, etc. This was hard at first, but eventually I came to realize that at the end of the day I really did not NEED to.  By not manually playing around in those areas, I’ve had better stability and easier times doing upgrades, etc.  
If you can think of your site being a SaaS solution instead of just another script to install, you’ll have a much easier time. 

Regarding the migration… Olivia and Marc have the process down to a science.  They will communicate exactly what is needed, work with you to agree on a date/time to do the move, explain exactly what needs to be done, etc. In a nutshell, you need to upload a complete copy of your site files (so they have any uploads and 3rd party resources) along with an export of your database.  They will import it and configure their side to handle it.  You can use a temporary address to test to make sure all is good and once ready, change the DNS to their control to make it live to the world. 

We arranged for our site to be taken offline at 3am while I exported everything and uploaded it to IPS. By 8am, I was doing my final testing and go live. 

My suggestion is contact @ASTRAPI, he's good and known servers specialist. I'm pretty sure that he would help you with these issues.

Yes, that way you will be able to identify the app that is not compatible with php 8.
Running the upgrader did it. 

That error that you posted above could be due to the fact that you overwrote your forum files with those from the latest version, but didn't run the upgrade. Hopefully upgrading the forum will fix the issue. 
Let us know how it will go.

yoursiteurl/admin/upgrade
 

@LiveG, this sounds frustrating.  I'd suggest hiring one of the people on this thread with "Provider" under their name.  Or find someone from here: https://invisioncommunity.com/third-party/providers-directory/. 

Just checked, it will most likely need an uninstall. But that will also delete the application without the ability to extract the files. 
 
I would extract them from your file manager. 

If you click the Modified files warning message, what do you get?
A word of advice, if I may, it would be best to upgrade your forum to the latest version. 

Let's do some detective work 😄 
Can you post here a list of all the custom apps/plugins that you have installed and maybe we will find the culprit.
If you are going to remove the apps, don't forget to make a backup of their database tables if you want to keep their data after reinstalling them.

The issue is that one of your custom apps is not compatible with php 8 and/or the latest version of Ipb. Looking at the error message, it affects the topics. 

I told you to ignore the Invision applications by indicating 'non-IPS'

It's perfectly normal - I doubt anyone has named their application "appname", and I wrongly assumed that the following hint was enough:
Look at the folders under /applications....they are the folders for the applications you have installed, figure out the non-IPS ones (which are forums/blog/cms/core/nexus/commerce/downloads/calendar/convert/gallery)

That's correct. I would suggest reaching out to the authors of the modifications to verify that their applications/plugins are compatible. 

Can you check the installed App's/plugin 's page here at the Marketplace to see if any of them is not compatible with php 8? That might save you some time. You should look especially into the apps/plugins that have to do with topics, as the error messages you posted above indicate that
 

Yes, switch php back to v7 and see if site works again which it should.
You may have some customisation that is incompatible with php v8.
Try disabling all applications and plugins, switch to default theme and language then tryphp v8 again.

What version of Invasion Community Suite?
What version of PHP?

Please check your server's PHP or web server error logs and paste what is being logged there.
If you don't know how to access this information, you will need to contact your hosting provider.

Thak you! @Miss_B @Marc Stridgen

You can also convert it yourself should your host will not help you with that. Have a look at this article. 
https://www.techandme.se/convert-myisam-to-innodb/
Don't forget to make first a backup of the database before the conversion. 

This is something done on your MySQL instance, not within your admin CP. If you are unsure, you should indeed contact your hosting company to assist you

To fix php8.x issue with compatibility scanner edit file
\marktopic\hooks\code_forums_topic.php and change line 213 from
public function mergeIn( $items, $keepLinks=false ) to this
public function mergeIn( array $items, $keepLinks=false ) and run compatibility scanner again.