https://forge.codesys.com/forge/talk/CODESYS-V2/thread/1f313b4f88/2020-02-27T19:43:13.113000ZRecent posts to downgrading from version 3.5.10.x to 3.5.6.x2020-02-27T19:43:13.113000Z2020-02-27T19:43:13.113000ZJennyBrunehttps://forge.codesys.com/u/jennybrune/https://forge.codesys.com9c6149921c07433613de5176cb563ca36890efd6

<div class="markdown_content"><p>I don't think this is a wise decision but go for it if you must. Maybe you can first uninstall the recent version.</p></div>

2020-02-27T19:43:11.840000Z2020-02-27T19:43:11.840000Zirfanmirzahttps://forge.codesys.com/u/irfanmirza/https://forge.codesys.comcacd36b68f394977b5680dc0e79d7130d561a541

<div class="markdown_content"><p>Hi, <br/> I had IDE version 3.5.6.60 installed on my machine and developed some applications with that version. Later, I installed IDE 3.5.10.x and this installation disturbed all my previous applications. </p> <p>If I open older application (in IDE 3.5.6.60 or in newer), I can not run the application anymore, I get some version mismatches with the runtime. This is because the CmpApp version 3.5.7 and higher have some new interfaces which were absent before. <br/> Is there any way I can downgrade PLC project to use the older version of libraries?</p> <p>Thanks &amp; Regards</p></div>