Upgrading from EE1 to EE2 - How do I manage the add-ons part of the process?

Question

I'm trying to updgrade from EE1.7.1 to EE2.9.2 by following the steps outlined in the documentation here https://ellislab.com/expressionengine/user-guide/installation/upgrade_from_1.x.html

The process seems straightforward enough, and I have run through it as a test and it seemed to work (except for addons). To my mind the biggest problem that I have is that I have no idea how to tackle this note right at the top of the upgrade page.

IMPORTANT Third-party add-ons from version 1.x will not work with ExpressionEngine 2. Please contact each add-on’s author for a 2.x-compatible version before upgrading, or your site may not function properly. The installer will automatically disable all extensions as part of the upgrade process.

How do I work out exactly what addons I have and who the author of each addon is? And what happens if there isn't a 2.x compatible version available?

Has anyone put together a more detailed how to guide on the upgrade process somewhere?

Answer 1

You should look the at the folder system/plugins/, which is where EECMS 1 keeps its plugins, and look for the name of each plugin or a readme file. The best place to look for new versions is devot-ee. Almost all EECMS add-ons can be found there.

The EECMS 2 plugins are separated into 4 categories:

• fieldtypes;
• accessories;
• modules;
• plugins.

All of the them should be saved on the folder system/expressionengine/third_party.

Every add-on have its own update process. Probably for a lot of them, it's just to upload its folder and install it on CP.