The developers have released new Skype version 6.21.0.104 for Windows in which some small errors have been corrected and a couple of small changes have been made. However, despite such a minor update, this version of Skype for Windows is very important for users of older computers. The problem is that some users of other versions of Skype, when trying to select the desired contact, get an error "Cannot change to undefined button (264,22)" and cannot use the program. For most computers, version 6.21.0.104 has not this defect and allows you to use Skype without problems.

On the other hand, you should take into consideration another important point – even if Skype does not give the above error, all the same you can have problems with video calls. More precisely, you won’t be able to make video calls if you have an old computer, and the processor does not support the SSE2 instruction set (a set of processor instructions which appeared in 2001). If so, alas, video calling will be disabled, and neither version 6.21.0.104, nor another version of Skype will help. The good news is that the rest of Skype will work without problems; furthermore, the processors that don’t support the SSE2 haven’t been produced for a long time.