autocad2013 not working after windows upgraded

[mishgan22_91]

i use autocad 2013 until yesterday when my windows8 upgraded to windows8.1, now my autocad does open it asks me to repair the license and to get a valid serial key. (it was free three year student version)

i need help... 

[rkmcswain]

You probably should not post your serial number and other date found on "2.jpg".

To borrow a reply from @jessica.t,

1. Visit http://knowledge.autodesk.com/contactus


2. Select “Activation & Registration” or “License Management”


3. Select appropriate subtopics from the pull-down menus


4. Select “I Still Need Help”  if you need personal assistance

[mishgan22_91]

OKAY THANKS... IL KP IN MIND NOT TO POST SERIAL NUMBER NEXT TIME...

[mishgan22_91]

"still need help" din work for me...

i have a new problem now... i tried downloading autocad 2014 and autocad 2015 on windows 8.1 but both didn't install... its gives a "communication error", what do i do???i need help!

[mishgan22_91]

here is a snapshot of the error which it show while installing

[Alfred.NESWADBA]

Hi,

do not start the install from internet, first download the application with "browser download"-option and from that downloaded file start the installation with admin permissions and disabled antivirus.

HTH, - alfred -