Question: I am using aptana studio v 3.4.2.201308081805 on windows 7, I know that v 3.5 is available because I was prompted to update to 3.5 on a different computer. 

I have not received the update prompt on my macbook air or on my work computer. Does anyone know how to force aptana to update to v 3.5?

Answer: 
Aptana has removed version 3.5 due to several bugs.
Current stable version is 3.4.2
You can check here [Aptana download](http://www.aptana.com/products/studio3/download)
Check out the other Stack Overflow question from [here](https://stackoverflow.com/questions/11182618/how-to-update-aptana-studio-to-the-latest). It's also about updating Aptana Studio. Basically, in your case, Aptana may not have the update sites list configured yet. You'll need to import the XML file containing these addresses (many people have had to deal with this, as show in the support thread [on Aptana Studio's support site](http://aptanastudio.tenderapp.com/discussions/problems/2791-available-software-sites-list-is-empty-on-aptana3) about adding update sites to Aptana. Also, check out [this](https://wiki.appcelerator.org/display/tis/Errors+While+Updating) page on the Appcelerator wiki about common issues with updating.