How to open the saved ITR on another computer. Try this though I am not 100% sure if it will work.
After you are done with your work on PC1, go ahead and install the utility on PC2.
On PC1 enable show hidden folders and copy C:\Users\<Username>\AppData\Roaming\ITDe-Filing folder to PC 2 under current active user. You will have to replace username with the name of user
e.g. if PC1 user is PCuser1 then the path will be C:\Users\PCuser1\AppData\Roaming\ITDe-Filing
now on PC2 is the username is PCuser2 then there the path will be C:\Users\PCuser2\AppData\Roaming\ITDe-Filing. The ITDe-filing folder under hidden directory Roaming holds all the saved data.
Disclaimer - I have never tried this but I know that deleting this catche clears all saved forms in the utility. So by copying it to another PC you should be able to retain your data. Unfortunately there's no migration utility or support provided by developers of the tool.