I also had this on win7 64bit, I ended up deleting all the files using the adobe un-installer.
I got the error again.
This is what Adobe told me to do - it worked.
This isn't the first time this had happened. In 65% of update scenarios I get an error and have to delete all of creative cloud and start again.
Some workflow, after i've been through hours of going around in circle on the help site, I don't feel creative - i feel upset, angry and in need of a drink and maybe start smoking again.
Anyway, I digress here's the solution - BTW i changed my name on this.
You are now chatting with 'Arul'
Arul:Hello. Welcome to Adobe Technical Support.
Arul:Hi Upsetcustomer
Arul:I understand that when you update Creative Cloud desktop app, you get Error 50. Is that right?
“Notcreativenow”:yes
Arul:Thank you for confirming. I'll be glad to check and help you with that.
Arul:Open Task Manager by clicking Ctrl+Shift+Esc and click on Processes tab.
“Notcreativenow”:just downloaded it before i called you
Arul:Okay.
Arul:Please install it.
Arul:Let me know if you face any issue.
“Notcreativenow”:ok running it
Arul:Great.
“Notcreativenow”:it's looking good Arul - its gone further than it did before
Arul:Awesome, Upsetcustomer.
Arul:I'm happy to hear that.
Arul:Keep me updating about the installation status.
“Notcreativenow”:will do
Arul:Thank you.
Arul:May I know the status?
“Notcreativenow”:its still going, about 80% done
Arul:Perfect.
“Notcreativenow”:its thinking about it , sort of stopped , at 80% , but i can hear it chuntering away
“Notcreativenow”:oh yes.. its going again now
“Notcreativenow”:( exciting stuff )
“Notcreativenow”:ha
Arul:Excellent, Upsetcustomer.
“Notcreativenow”:ok and its up , just logging in
Arul:Wonderful.
Arul:I'm happy that we were able to resolve the issue.
“Notcreativenow”:i love you
Arul:Thank you for giving me an opportunity to assist you today.
Arul:Is there anything else I can help you with?
Arul:It my pleasure to resolve your issue.
Arul:Do you have any more questions?
“Notcreativenow”:no, just tell adobe , everytime they ask me to update something 65% of the time , it fails and i have to delete everything, start again ... and i end up not being creative but instead turning to cigarettes and booze
“
Arul:Sorry for the inconvenience.
“Notcreativenow”:thank you so much Arul:I will definite take your suggestion to the relevant team.
Arul:You are always welcome.
Arul:You may receive an email that will contain a link to complete an optional survey to provide your feedback on the support experience. Your feedback is very much appreciated.