i downloaded the exe file on obsidian.md, but failed when i try to install, it said “you must have a x64 system”. Since my computer is win 7, x86. Is it possible that obsidian could be open in my computer? Or does Obsidian provide with a x86 version?
unfortunately, no.
sadly 
We’re considering adding installer for the less common platforms and put them on a dedicated page soon. Sorry about the inconvenience!
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That‘s great! Thank you so much!