Relax. You misunderstand what the "HQ" means concerning the topic. In the past several version releases, the pictures in the game had been compressed in size (FILE size...NOT resolution - dimension size) because the download was getting so large. Some people complained, especially if the were using a large monitor (I use a 75" 4K UHD Curved TV) because the picture compression reduces the quality of the picture (compressed pics get "grainy" on larger displays, but wouldn't be noticeable on something like a laptop-sized screen).
So there were TWO versions of the recent update...COMPRESSED (the 1.5 GB download) and the "HQ" (the 5.5 GB one). The pics in the 5.5 GB one do look a LOT better on larger monitors like my TV, even though both version pics are still only 720p RESOLUTION.
And in this case, don't confuse "compressed" with ZIP(ing) or RAR(ing) the entire download into one file to make the download smaller. They are two completely different things. PRIOR to ZIP(ing) the game into a one-file download, all the INDIVIDUAL pics were "compressed" in the 1.5 GB version. THEN everything was "ZIP(ped)" to make the one-file download. To see the difference, compare the SAME picture's file size AFTER un-zipping each download. The 5.5 GB download pics will have larger FILE sizes, but the picture's DIMENSIONS will still be the same 720p.
BTW, the DIMENSIONS of a picture are NOT the determining factor in whether it is "High Quality" or not. People take 640 x 480 pics and JUST resize them to 1920 x 1080, then post them in forums as "HQ" all the time. But they are blurry as h*ll on anything larger than a smartphone screen. People who do that have the same misunderstanding of what makes something "HQ" to begin with.