I am also having a problem with digital designing as I can't download my program any more due to receiving the message telling me that the adobe air installation file is damaged!!
I see that I am not the only person having this problem surely somebody from Adobe support team should be looking into this and informing us of the progress to correct it.
My program DoCraft Digital Designer has worked perfectly up until the end of 2017 my friend is also having the same problem and we have spent a huge amount of money on purchasing dvd's/cd's to use with it which are now useless. this program requires Adobe Air to be installed before we can download the designer program.
Please can somebody from Adobe find a solution soon?
I must admit it is also very frustrating that there are no contact details to enable me to speak to a support member I think this should be corrected then maybe our voice will be heard.