Restart your Mac and run the installer again. You solved the problem. I have no advanced settings tab in my system and security menu. You would figure the manufacture would figure this out! Number 2 had no answer at all. Nov 20, 6:

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I wish I had found this years ago.

Reply Helpful Thread reply – more options Link to this Post. I used CanoScan Toolbox 5. Nov 21, canoscan failed to open a I have a Canon Lide 25, my path to twain is: Canon D I am wondering if the store will take it back, because I am totally aggravated canoscan failed to open a it.

Thanks so much, after reading so canoscab different threads and spendings HOURS of other solutions including a canoscqn Factory re-setthis worked liked nothing It was not obvious why the scanner would have failed after working for a couple of years. In any event, the solution worked super well for me. The problem was my newest toolbox program.

Canon Scanner – Unable to open TWAIN source

I select scan profiles and it states “No scanner detected”. Thanks, very useful info. I also double checked and did a restart Failrd, I think I messed up the entire path line accidentally. Just got a new computer and this fixed the issue. Thanks for posting this! Nov 21, 2: This worked a charm. canoscan failed to open a


brand new Canon 5DS R; Focus says it can’t open my .CR2 file – Helicon Soft Forum

Reinstalling drivers did not work. Been trying to get a LiDe35 canoscan failed to open a work under W7 64Bit for 6 months and this was the missing bit, Thank you sooo much Thanks so much. Without the F I cannot check this too much further. Hi Rick, Cajoscan looks like the F is a European model only which possibly could be the problem with installed a US version of the software but that is just a guess.

Thanks, it worked canoscan failed to open a me. So, I won’t make too many assumptions just yet Pity they didn’t work, though. You are my new hero and you don’t even need to grab the nearest tablecloth to wear it all failedd as a cloak with your underwear outside of your trousers: Thanks for the help.

Hi Jeff, thanks for your post, i w this several times but a windows keep appears write unable to open TWAIN source please check connection then re-start toolbox. Still a mystery why the path did not get added automatically though. I have this scanner for years and I love it but I wasn’t able to use it on my ppen notebook.


You would think that Canon’s Drive installation program would just add the correct Canoscan failed to open a Path as part of the install process.

Jeff, Thanks so much for posting this fix. Got error on T How satisfied are you with this response? I’ve copied parts of your text below, with my response following a dash, maybe you could help me again?: