I have previously made Thingworx Extension with source code. But for setting Eclipse environment, following is required:
2. twx_eclipse_plugin_version =188.8.131.52608021836
Please provide the link to download the same versions of SDKs and Plugin.
I could get the latest versions ,
but for my Extension project old versions of SDK & Plugin is required.
Article - "How to install Eclipse Plugin for ThingWorx Extensions and the required Extension SDK": https://www.ptc.com/en/support/article/CS233537
From the "Help Center" - "Installing the Eclipse Plugin for ThingWorx Extension Development": https://www.ptc.com/en/support/article/CS233537
Two questions for clarification - please answer each of them:
-are you really developing an extension for a ThingWorx 8.3 server? That ThingWorx version has been out of support for a long time. Or you want to upgrade an extension you previously designed for ThingWorx 8.3 to a more recent ThingWorx version?
-you mentioned "for setting Eclipse environment, following is required:...", Why do you say this? Please share exactly what you tried to do, and what error you encountered. I am aware that you pasted the contents of the extension.properties found in the project workspace folder of the extension, but that does not mean it is "required".