When I import the product xml file I get an error that says:
HTML Code:
XML Error: EntityRef: expecting ';' at Line 8
When I tried it the first time I just deleted that whole line.
Looking at another product file, I think your versioncheckurl should look like this:
HTML Code:
<versioncheckurl><![CDATA[https://vborg.vbsupport.ru/misc.php?do=producthelp&pid=whoisip_002]]></versioncheckurl>
I think maybe it's the '&' char that's causing a problem without the CDATA tags. Maybe using &pid= in place of &pid= would also work.