For sure, this is a lot clearer than your first post with 2 lines
Let’s restart from the begnining
- About “viruses”
VirusTotal almost always finds something as it is an aggregation of lots of different antiviruses, just check in these forums or on GitHub
The files on itchi.io are identical to the ones you can find on GitHub for example, you can download them and compare their checksums.
It would be surprising that no one would have discovered a virus in more than 6 months since first publication.
In any case, you can still download the source code and compile it by yourself 
- About the .tar.gz instead of Windows 64bit portable
I downloaded it and yes, there is a mistake, this is the source code, not a Linux version by the way.
No big deal, all the installers can be also found on GitHub, FossHub and SourceForge.
A simple report could have been sufficient, which I will do just by summoning the spirit of Synfig:
@KonstantinDmitriev
Other thing, a 32bit version runs fine on a 64bit system, it is just a matter of addressing, operand size and memory capabilities which would reach the maximum offered by the operating system and the CPU. It was the 16bit which were problematic on newer systems, and even for them this is now working.
- About your antivirus
I’m glad that you have the best one on the market, these tools are only needed on Windows and if you are used to download suspicious stuff, and still they are mostly a placebo.
I just turned 45, with more than 30 years of experience in computers (MS-DOS 3 on i286) and I saw many times antiviruses damage legit downloaded files and even damage Windows…
Then I turned to Linux for good (the big difference is that on Windows, you have admin rights by default)
- Now about your “suggestion to revise the site” which “seems messed up”
Synfig is free (as in speech and beer) and open-source non-profit software, developed, maintained and managed by volunteers, with infrastructures financed by donations.
Finances will even be harder now with current political sanctions.
The choice to use itchi.io (or gumroad in the past) as page of download is to propose to make a little donation, this site taking care of the transactions.
Note that is a proposition and not an obligation, the text is very clear, and there are also other download sites (already mentionned in these forums, you can use the search function to check).
The editorial choices belong to the editors, not to you.
In short, your first post could just have been “Hey guys, there is a mistake in the download link of 64bit portable version”
There is always a way to say the things in a different way.
And if you take the time to read again your text, you will understand why I suggest you to read the definition of this term on Wikipedia: Courtesy
P.S.: Here is the download section on GitHub : Releases · synfig/synfig · GitHub