problems installation

I get this message after upgrading (yes, I removed the older version). After getting this, I removed the files (again), then re-installed the extentions. Still get this error.

This error means you need to clear your winfilecache .dat file in your local users configuration folder for Dreamweaver.

The problem seems to return, and there is not menu item for server behaviors. I am using DW version 12.2, Build 6006. The upgrade must have been installed prior to my recent re-install of WebbAssist, as WebAssist seems to have disappeared, at least in part.
I'm patient, so if you think this is the upgrade monster, I'll just wait to hear.

If there isn't a server behaviors window then you have to install the free "Database and Server Behaviors" extension from the Adobe store. It sounds like you will have to reinstall the webassist extensions as well if there is no webassist menu.

I nuked everything and re-installed. Seems to work ok now, but I still get an error page when I test from Dreamweaver. See attached, as it shows both the error and the code. Looks like it cannot find the connection string ($new_iap_localhost). I copied the webassist folders to the test server, as well as the connection folder (with the files). I'm using WAMP server, and set it to use php 5, as Webassist seems to not run under php7x. Not sure what I should do!

A standard MySQL connection won't work in php7. You would have to use mySQLi. However it doesn't appear that is the issue in this case. Can you attach a copy of the entire .php page and connection file and I can see if there is something else wrong.

Thank you Ray. Here is the requested page (a simple one, just to get me re-started in the process) and associated Connection file.
BTW, if this warrants the $99 special help fee, I'm glad to pay that, as I know you time and help is valuable, and I'm sure I'll learn that much from delving into this! So if you need to, let me know and I'll go thru the correct channels...

It looks like you have a mysqli connection, but the code on the page is all standard mysql. The connection file has to match the code. I think your best bet is to delete this connection and create a new one with the same name. Make sure it is a regular mysql connection and not a mysqli connection. Then you will have to make sure that your web server is running php6 or earlier (not php7), but based on the errors you were getting I think that isn't a problem.

The code was all "written " by DataAssist from the menus. I've re-installed it several times, but I'll leave the connection, and start over from nothing and see what happens. Here is the new file, which throws the same errors as the old one.

That won't help. The code written with DataAssist won't work with mySQLi. The issue is with the connection and not the pages built by DataAssist. Re-running the data assist wizard to recreate the pages won't help. It will produce the same problem with the same pages. The solution is as I have stated. Delete and re-create the connection as a standard mysql connection. The pages will then begin to work.