Avast Antivirus software uses license for validating the commercial versions of the software. The file format of the license file used for this purpose is .AVASTLIC. This file format contains information related with the purchased license of the user.
Generally the data mentioned in such file includes authorization information, subscription information, username, purchased product details and expiry date of the license. The installation of license is done by the application itself and the user has to just browse and select the file. The data is written in such format which makes it hard for the user to make any change.
In addition to the problem described above, i.e. the lack of the appropriate application to support the .AVASTLIC file, there may be several reasons that cause problems with opening and operation of the data format:
A quite common problem is the lack of application in the appropriate version. Even if you have an application, with the help of which you should open the .AVASTLIC file, you may have a problem with it because of its version. Perhaps in previous versions the application has not yet supported the .AVASTLIC file, so download the update and check again.
If you have already installed the appropriate application, and it is the correct version, the file may not open correctly, because the operating system does not have information that this program supports the file. So you need to "show" which program the computer should use. To do this:
It also happens that the file you want to open is corrupt and therefore there is no such possibility. In this situation, you should find its different version, or ask a person from whom you got, to send it again.