After you've opened downloaded Statistics file in main program window (Streaks & Series tab) you can see all available longest streaks related to games on schedule as described in title of Statistics file, you can explore streaks by leagues, game / fixture and do some other filtering...
Analysis and search for longest streaks (from which all this data is made of) is based on all games played from season 2004/05 up to date (some leagues from season 2005/06). Games analyzed are just games played in selected league, if team was relegated or promoted from that league, games played in this period of time are ignored when searching for longest strek. Friendly, Play Offs and Cup games are also ignored.
To get longest streak, we need to look at last series of games with the same outcome, and if this last series of games is longer or equal to any other series of games in a row with the same outcome occurred before then we've got longest streak.
I this case looking at game outcome is not just looking it as Home Win, Draw or Away Win, there are many types of outcomes, groups of outcomes, like Over 2,5 goals, Half Time Draw, Final Score 2:1, 0:0.., Both Teams Score...that are analyzed.
Here's example in more detail
As you can see in picture above we have scheduled game between Almeira and Barcelona
Analysis for upcoming match are made on 2 general result tables, Almeira overall games and Barcelona overall games + 2 additional tables Almeria "Home games only" table and Barcelona "Away side games only" table.
Games played from 2004/05 season + current are included in analysis, so Overall games are only games played in this period of time, also keep in mind that if either of teams was relegated in lower league games played in that period of time are not included in analysis, only games played in current league are analyzed. Easiest way to see that one of the teams was promoted / relegated in this period is by looking at "Games" column in main streak list, more on this later...
Analysis on this 4 tables will be based on all kinds of bets (over 30), in this example "Second Half Under 0,5" streak is selected, and as you can notice this selected streak is related to Barcelona (only Away games, games Barcelona played away), you can see that under Streak related to (source table), marked with red color is displayed "Away Team (Only Away Games)". This indicates that Barcelona never had more than 2 games in a row "Under 0,5 goals in Second half" in this last 5 season period of time, so this situation is reported as longest streak.
In this case streak information in streak list looks like this.
As you can see Home Team is Almeria and Away Team is Barcelona, streak type is Second Half Under 0,5 and Streak Length is 2, it means 2 last games Barcelona played as Away Team (Source Table) ended Under 0,5 goals in Second Half. Games column is number of how many games were included in analysis, in this case last 107 Barcelona played Away that equals last 5 seasons + current Away games.
Each of 4 tables will be processed and searched for longest streak for every bet type, Over 1,5, Under 1,5, Team Scores and more... So it's done for every game on schedule. As you can see that's lot of analyzing and it would take a long long time to find this by yourself by just looking at raw result tables.

Meaning of Colums in main Streak list
Home Team: Home team in scheduled game
Away Team: Away team in scheduled game
Streak Type: Type of outcome in last series of x games, bet type
Streak Length: How many last games ended with the same outcome, based on Streak Type
Games: How many last games played are included in analysis.
As you know not all leagues have same number of teams and because of that don't play same number of games in the season.. There's also Overall and Home/Away games only analysis, so for example number of games played only at home cannot be the same as overall games, and as already mentioned team promoting or relegation can decrease number of analyzed games since these games are not included in analysis.
Against streak bet: bet type that's against last series of game outcomes
League: league that selected game is associated with.

Streak Filters
Use streak filters to find faster information you need.
Streak filter - allows you to select type of streak you're looking for without displaying other types. If you for example need longest Draw streaks you can select "Show only streaks of selected type", select Draw and hit "Refresh Streaks" button.
Keep in mind that this will only show Draw streaks related to Selected League or Game, if you want to see streaks for all leagues make sure to select ALL Leagues.
Display order - let's you display streaks by one of available criteria, you can display longest streaks at the top, by selecting "Streak Length" from the list and with Descending checked, make sure to hit "Refresh Streaks" button, or you can select "Streak" to group streaks by type (use it when Show All streaks option is checked)...
Streak markings - you can mark selected streak from the list by pressing "space" key, and quickly show it later by using "Show all marked" or "Show marked / filtered" buttons.
Streaks limited to 30/15 - this will display longest streaks based on last 30 overall games and 15 Home / Away games only, not based on last 5-6 seasons. You'll get more longest streaks, this is useful for bets like Draw, Team Scores, Clean Sheet...