The project that I saved as an old version does not open

Hello everyone; I cannot open my project, which I drew in ide cad architecture 8.61 licensed version, on my computer with ide cad 7 architecture and ide cad 8 architecture installed, even though I save the low version (ide cad 7 architecture). Asking for a more recent version. What can I do ?
 
Re: version shortage Hello, if you upload the project you had a problem with, we can offer you a solution by examining the project. Good work
 
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