Question for Joomla V1.5

First of all, do I need to install SIG free version before I install SIG PRO ?

I tried to de-install SIG PRO, but I got the answer it is not possible.

Is there a way to manually de-install SIG PRO and SIG free as well as to properly go back to my initial state ?

In the question "Do I need to install SIG free version before I install SIG PRO ?" the answer is "No".
What are the steps you are following?
What is the exact message you get after your try?

I can't remember exactly what I did, but finally I have both versions installed, and the plugins' parameters are not what expected. For SIG PRO I get the display : "There is no parameters for this plugin" (in fench)

Look at the image that is attached, they are information that are missing for SIG PRO.

When I try to de-install SIG PRO I get two messages :

A red one : Plugin uninstall: Manifest file invalid or not found
A blue one : Desinstaller Plugin erreur

note: I use the french version of Joomla.

Hi there!

Well, you cannot use the pro and the free version together, they use same css and maybe have conflicts cause of that.

Please, un-install all of them.
If you can't, just remove the files of the plugins from the server
and remove the entry from the #__plugins table.

Then install again one of them. Not both.

Thank you.

Thank you very munch,

I uninstalled SIG, I removed the SIG PRO entry from the *_plugins table and then it has been possible to install SIG pro with success.

Simple Image Gallery is a very helpful plugin. The PRO version is great, mainly with the help of software like "DirLister"

Best regards.
Aristide