Yes, the size of Adobe Reader4.0 is about 4-5M. It supports PDF 1.3 format. General reading should be possible. There is an old version of acrobat reader here.

/program.php？ n=acrobat

The standard of PDF document is constantly updated, and now it is 1.7 version. If you take the previous version, it is very likely that many new attributes will not be recognized. For example, pictures in JBIG mode are only supported after 1.4, and now most large pictures use this mode. There are still many comments that are not supported.

Question, why can't I use Foxit Reader2? Its size is less than 3 meters. Soon, right?

One more thing: the things given upstairs are very attractive, but the downloaded things are not adobe reader! Cheating thing. What a pity. Besides, this extended version usually requires us to download east and west, which is annoying!