BlitzIn 3.12.6 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
The most frequent installer filenames for the software include: BlitzIn30.exe, blitzin.exe, Blitzin2.exe, BlitzIn25.exe and BlitzIn26.exe etc. The actual developer of the free program is Internet Chess Club. The most popular versions among BlitzIn users are 3.1, 3.0 and 2.7. This PC software can be installed on 32-bit versions of Windows XP/XP Professional/Vista/7/8/10/11. We recommend checking the downloaded files with any free antivirus. The software is included in Games.
From the developer:
BlitzIn is a program that lets you play chess in the ICC (Internet Chess Club) website. It also lets you watch the chess tournaments that are organized in the site. Once connected, the "list of events" is a fast way to access the features of ICC. The program is free to use, but you need to buy membership to play online.
You may want to check out more software, such as ICC Dasher, which might be related to BlitzIn.